{"id":2590,"date":"2022-01-21T09:23:46","date_gmt":"2022-01-21T02:23:46","guid":{"rendered":"https:\/\/cryptoinsider.asia\/?p=2590"},"modified":"2022-01-21T09:23:46","modified_gmt":"2022-01-21T02:23:46","slug":"witnesses-debate-crypto-minings-efficiency-in-congressional-hearing-on-environment","status":"publish","type":"post","link":"https:\/\/cryptoinsider.asia\/vi\/witnesses-debate-crypto-minings-efficiency-in-congressional-hearing-on-environment\/","title":{"rendered":"Tranh lu\u1eadn v\u1ec1 t\u00ednh hi\u1ec7u qu\u1ea3 c\u1ee7a vi\u1ec7c khai th\u00e1c ti\u1ec1n \u0111i\u1ec7n t\u1eed trong phi\u00ean \u0111i\u1ec1u tr\u1ea7n v\u1ec1 m\u00f4i tr\u01b0\u1eddng"},"content":{"rendered":"

C\u00e1c c\u00e2u h\u1ecfi c\u1ee7a c\u00e1c nh\u00e0 l\u1eadp ph\u00e1p tr\u1ea3i d\u00e0i t\u1eeb nh\u1eefng v\u1ea5n \u0111\u1ec1 c\u01a1 b\u1ea3n v\u1ec1 blockchain \u0111\u1ebfn c\u00e1c c\u00e2u h\u1ecfi v\u1ec1 c\u00e1c ngu\u1ed3n n\u0103ng l\u01b0\u1ee3ng kh\u00e1c nhau.<\/span><\/h2>\n

Trong khi m\u1ed9t s\u1ed1 nh\u00e0 l\u1eadp ph\u00e1p ph\u1ea3i v\u1eadt l\u1ed9n v\u1edbi nh\u1eefng ki\u1ebfn \u200b\u200bth\u1ee9c c\u01a1 b\u1ea3n v\u1ec1 t\u00e0i s\u1ea3n k\u1ef9 thu\u1eadt s\u1ed1, c\u00e1c v\u1ea5n \u0111\u1ec1 ch\u00ednh v\u1ec1 \u0111\u1ecbnh ngh\u0129a hi\u1ec7u qu\u1ea3 n\u0103ng l\u01b0\u1ee3ng v\u00e0 c\u00e1ch c\u00e1c c\u00f4ng c\u1ee5 khai th\u00e1c ti\u1ec1n \u0111i\u1ec7n t\u1eed \u0111\u01b0\u1ee3c cung c\u1ea5p n\u0103ng l\u01b0\u1ee3ng \u0111\u00e3 \u0111\u01b0\u1ee3c tranh lu\u1eadn tr\u00ean s\u00e0n c\u1ee7a H\u1ea1 vi\u1ec7n trong phi\u00ean \u0111i\u1ec1u tr\u1ea7n c\u1ee7a Qu\u1ed1c h\u1ed9i h\u00f4m th\u1ee9 N\u0103m v\u1ec1 d\u1ea5u \u1ea5n m\u00f4i tr\u01b0\u1eddng c\u1ee7a ng\u00e0nh c\u00f4ng nghi\u1ec7p ti\u1ec1n \u0111i\u1ec7n t\u1eed.<\/span><\/p>\n

Tr\u01b0\u1edbc khi c\u00e1c nh\u00e0 l\u1eadp ph\u00e1p c\u00f3 th\u1ec3 \u0111\u1eb7t ra ch\u00ednh s\u00e1ch v\u1ec1 m\u1ee9c ti\u00eau th\u1ee5 n\u0103ng l\u01b0\u1ee3ng c\u1ee7a ti\u1ec1n \u0111i\u1ec7n t\u1eed, h\u1ecd c\u1ea7n ph\u1ea3i n\u1eafm \u0111\u01b0\u1ee3c c\u00e1c nguy\u00ean t\u1eafc c\u01a1 b\u1ea3n c\u1ee7a t\u00e0i s\u1ea3n k\u1ef9 thu\u1eadt s\u1ed1.<\/span><\/p>\n

\u0110i\u1ec1u n\u00e0y \u0111\u00e3 \u0111\u01b0\u1ee3c hi\u1ec3n th\u1ecb \u0111\u1ea7y \u0111\u1ee7 t\u1ea1i phi\u00ean \u0111i\u1ec1u tr\u1ea7n k\u00e9o d\u00e0i hai gi\u1edd 15 ph\u00fat \u0111\u01b0\u1ee3c t\u1ed5 ch\u1ee9c b\u1edfi ti\u1ec3u ban Gi\u00e1m s\u00e1t v\u00e0 \u0110i\u1ec1u tra trong \u1ee6y ban N\u0103ng l\u01b0\u1ee3ng v\u00e0 Th\u01b0\u01a1ng m\u1ea1i H\u1ea1 vi\u1ec7n nh\u1eb1m ki\u1ec3m tra t\u00e1c \u0111\u1ed9ng m\u00f4i tr\u01b0\u1eddng c\u1ee7a vi\u1ec7c khai th\u00e1c ti\u1ec1n \u0111i\u1ec7n t\u1eed<\/span><\/p>\n

Bu\u1ed5i \u0111i\u1ec1u tr\u1ea7n c\u00f3 s\u1ef1 g\u00f3p m\u1eb7t c\u1ee7a Gi\u00e1o s\u01b0 c\u00f4ng ngh\u1ec7 Cornell Ari Juels, Gi\u00e1m \u0111\u1ed1c \u0111i\u1ec1u h\u00e0nh Soluna Computing John Belizaire, Gi\u00e1m \u0111\u1ed1c \u0111i\u1ec1u h\u00e0nh BitFury Brian Brooks, c\u1ef1u T\u1ed5ng gi\u00e1m \u0111\u1ed1c Khu ti\u1ec7n \u00edch c\u00f4ng c\u1ed9ng qu\u1eadn Chelan Steven Wright v\u00e0 c\u1ed5 \u0111\u00f4ng c\u1ee7a Jordan Ramis, Gregory Zerzan, th\u1ea3o lu\u1eadn v\u1ec1 m\u1ee9c ti\u00eau th\u1ee5 n\u0103ng l\u01b0\u1ee3ng li\u00ean quan \u0111\u1ebfn s\u1ef1 \u0111\u1ed3ng thu\u1eadn b\u1eb1ng ch\u1ee9ng c\u00f4ng vi\u1ec7c (PoW) m\u00f4 h\u00ecnh x\u00e1c th\u1ef1c c\u00e1c giao d\u1ecbch ti\u1ec1n \u0111i\u1ec7n t\u1eed.<\/span><\/p>\n

\u201cM\u1ed9t s\u1ed1 chuy\u00ean gia \u01b0\u1edbc t\u00ednh khai th\u00e1c Bitcoin s\u1eed d\u1ee5ng t\u1eeb 110 \u0111\u1ebfn 188 terawatt (TW) n\u0103ng l\u01b0\u1ee3ng c\u1ee7a th\u1ebf gi\u1edbi v\u00e0 h\u00e0ng n\u0103m, s\u1eed d\u1ee5ng nhi\u1ec1u n\u0103ng l\u01b0\u1ee3ng h\u01a1n so v\u1edbi m\u1ed9t s\u1ed1 qu\u1ed1c gia nh\u1ecf\u201d, \u0110\u1ea1i di\u1ec7n Howard Griffith (R-Va.) cho bi\u1ebft. \u201cC\u00e2u h\u1ecfi \u0111\u1eb7t ra l\u00e0 c\u01a1 s\u1edf h\u1ea1 t\u1ea7ng \u0111i\u1ec7n hi\u1ec7n t\u1ea1i c\u1ee7a ch\u00fang ta c\u00f3 th\u1ec3 h\u1ed7 tr\u1ee3 m\u1ee9c ti\u00eau th\u1ee5 n\u00e0y kh\u00f4ng?\u201d, \u00d4ng n\u00f3i th\u00eam.<\/span><\/p>\n

Nh\u00e2n ch\u1ee9ng \u0111\u1ea7u ti\u00ean l\u00e0 Ari Juels c\u1ee7a Cornell Tech. Kh\u00f4ng c\u00f3 g\u00ec b\u00ed m\u1eadt khi m\u00f4 h\u00ecnh \u0111\u1ed3ng thu\u1eadn PoW, \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng b\u1edfi hai lo\u1ea1i ti\u1ec1n \u0111i\u1ec7n t\u1eed l\u1edbn nh\u1ea5t theo v\u1ed1n h\u00f3a th\u1ecb tr\u01b0\u1eddng, bitcoin v\u00e0 ether, \u0111\u00f2i h\u1ecfi m\u1ed9t l\u01b0\u1ee3ng n\u0103ng l\u01b0\u1ee3ng l\u1edbn. Tr\u00ean th\u1ef1c t\u1ebf, m\u1ed9t s\u1ed1 ngu\u1ed3n d\u1eef li\u1ec7u \u0111\u00e3 so s\u00e1nh n\u0103ng l\u01b0\u1ee3ng c\u1ea7n thi\u1ebft c\u1ee7a bitcoin v\u1edbi m\u1ee9c ti\u00eau th\u1ee5 \u0111i\u1ec7n n\u0103ng c\u1ee7a c\u1ea3 m\u1ed9t qu\u1ed1c gia.<\/span><\/p>\n

C\u00e1c nh\u00e2n ch\u1ee9ng t\u1ea1i phi\u00ean \u0111i\u1ec1u tr\u1ea7n \u0111\u00e3 t\u00ecm hi\u1ec3u s\u00e2u h\u01a1n v\u1ec1 d\u1eef li\u1ec7u v\u00e0 n\u00f3i v\u1edbi c\u00e1c nh\u00e0 l\u1eadp ph\u00e1p r\u1eb1ng \u0111\u00f3 kh\u00f4ng ph\u1ea3i l\u00e0 m\u1ed9t s\u1ef1 so s\u00e1nh gi\u1eefa t\u00e1o v\u00e0 t\u00e1o, v\u1edbi s\u1ef1 k\u1ebft h\u1ee3p c\u1ee7a c\u00e1c ngu\u1ed3n \u0111i\u1ec7n \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 x\u00e1c th\u1ef1c giao d\u1ecbch.<\/span><\/p>\n

\u201cM\u1ed9t ho\u1ea1t \u0111\u1ed9ng ti\u00eau th\u1ee5 100 TW n\u0103ng l\u01b0\u1ee3ng ho\u00e0n to\u00e0n c\u00f3 ngu\u1ed3n g\u1ed1c t\u1eeb than \u0111\u00e1 ho\u1eb7c d\u1ea7u s\u1ebd l\u00e0m t\u0103ng l\u01b0\u1ee3ng carbon v\u00e0o m\u00f4i tr\u01b0\u1eddng v\u00e0 ti\u00eau th\u1ee5 m\u1ed9t ngu\u1ed3n t\u00e0i nguy\u00ean khan hi\u1ebfm; Brian Brooks c\u1ee7a Bitfury, c\u1ef1u gi\u00e1m \u0111\u1ed1c t\u00ednh to\u00e1n ti\u1ec1n t\u1ec7 c\u1ee7a Bitfury, cho bi\u1ebft:<\/span><\/p>\n

\u00d4ng cung c\u1ea5p d\u1eef li\u1ec7u r\u1eb1ng h\u1ed7n h\u1ee3p n\u0103ng l\u01b0\u1ee3ng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng b\u1edfi khai th\u00e1c bitcoin v\u00e0o n\u0103m ngo\u00e1i kho\u1ea3ng 58% c\u00f3 ngu\u1ed3n g\u1ed1c b\u1ec1n v\u1eefng, bao g\u1ed3m th\u1ee7y \u0111i\u1ec7n gi\u00f3, n\u0103ng l\u01b0\u1ee3ng m\u1eb7t tr\u1eddi, n\u0103ng l\u01b0\u1ee3ng h\u1ea1t nh\u00e2n v\u00e0 b\u00f9 \u0111\u1eafp carbon, so v\u1edbi 31% c\u1ee7a to\u00e0n b\u1ed9 l\u01b0\u1edbi n\u0103ng l\u01b0\u1ee3ng Hoa K\u1ef3.<\/span><\/p>\n

Juels v\u00e0 Brooks \u0111\u00e3 tranh lu\u1eadn v\u1ec1 hi\u1ec7u qu\u1ea3 c\u1ee7a vi\u1ec7c khai th\u00e1c ti\u1ec1n \u0111i\u1ec7n t\u1eed \u1edf ph\u1ea7n sau c\u1ee7a phi\u00ean \u0111i\u1ec1u tr\u1ea7n. Brooks l\u1eadp lu\u1eadn r\u1eb1ng c\u00e1c m\u00e1y hi\u1ec7u qu\u1ea3 h\u01a1n, theo thu\u1eadt ng\u1eef c\u00f4ng nghi\u1ec7p th\u01b0\u1eddng c\u00f3 ngh\u0129a l\u00e0 ch\u00fang \u0111\u1ed1t \u00edt \u0111i\u1ec7n h\u01a1n tr\u00ean m\u1ed7i terahash, c\u00f3 ngh\u0129a l\u00e0 m\u1ed9t m\u1ea1ng l\u01b0\u1edbi hi\u1ec7u qu\u1ea3 h\u01a1n v\u1ec1 t\u1ed5ng th\u1ec3.<\/span><\/p>\n

Juels tranh lu\u1eadn r\u1eb1ng \u0111i\u1ec1u th\u1ef1c s\u1ef1 quan tr\u1ecdng \u0111\u1ed1i v\u1edbi ng\u01b0\u1eddi ti\u00eau d\u00f9ng l\u00e0 l\u01b0\u1ee3ng \u0111i\u1ec7n b\u1ecb \u0111\u1ed1t ch\u00e1y tr\u00ean m\u1ed7i s\u1ed1 giao d\u1ecbch \u0111\u01b0\u1ee3c x\u1eed l\u00fd. V\u00ec c\u00e1c giao d\u1ecbch m\u1ed7i gi\u00e2y g\u1ea7n nh\u01b0 v\u1eabn \u1ed5n \u0111\u1ecbnh \u1edf m\u1ee9c 5 l\u1ea7n m\u1ed7i gi\u00e2y, trong khi vi\u1ec7c s\u1eed d\u1ee5ng n\u0103ng l\u01b0\u1ee3ng c\u1ee7a m\u1ea1ng \u0111\u00e3 t\u0103ng l\u00ean, m\u1ea1ng bitcoin th\u1ef1c s\u1ef1 \u0111\u00e3 tr\u1edf n\u00ean k\u00e9m hi\u1ec7u qu\u1ea3 h\u01a1n trong v\u00e0i n\u0103m qua, Juels n\u00f3i.<\/span><\/p>\n

John Belizaire c\u1ee7a Soluna v\u00e0 Gregory Zerzan, c\u1ed5 \u0111\u00f4ng c\u1ee7a Jordan Ramis PC, n\u00f3i r\u1eb1ng vi\u1ec7c khai th\u00e1c ti\u1ec1n \u0111i\u1ec7n t\u1eed th\u1ef1c s\u1ef1 gi\u00fap c\u00e1c nh\u00e0 s\u1ea3n xu\u1ea5t n\u0103ng l\u01b0\u1ee3ng t\u00e1i t\u1ea1o b\u00e1n \u0111i\u1ec7n b\u1ecb l\u00e3ng ph\u00ed, do \u0111\u00f3 cung c\u1ea5p cho h\u1ecd nhi\u1ec1u v\u1ed1n c\u1ea7n thi\u1ebft.<\/span><\/p>\n

T\u01b0\u01a1ng t\u1ef1, v\u00e0o cu\u1ed1i phi\u00ean \u0111i\u1ec1u tr\u1ea7n, Brooks c\u0169ng \u0111\u1ec1 c\u1eadp r\u1eb1ng BitFury ch\u1ee7 y\u1ebfu l\u00e0m vi\u1ec7c v\u1edbi c\u00e1c nh\u00e0 cung c\u1ea5p ti\u1ec7n \u00edch \u0111\u1ecba ph\u01b0\u01a1ng \u201cb\u1edfi v\u00ec h\u1ecd ch\u1ec9 c\u00f3 th\u1ec3 l\u00e0m cho n\u1ec1n kinh t\u1ebf ho\u1ea1t \u0111\u1ed9ng n\u1ebfu c\u00f3 m\u1ed9t ng\u01b0\u1eddi ti\u00eau d\u00f9ng c\u01a1 b\u1ea3n\u201d, c\u00f3 ngh\u0129a l\u00e0 c\u00e1c th\u1ee3 \u0111\u00e0o.<\/span><\/p>\n

Ph\u1ea7n t\u1ed1t h\u01a1n c\u1ee7a phi\u00ean \u0111i\u1ec1u tr\u1ea7n t\u1eadp trung v\u00e0o nh\u1eefng \u0111i\u1ec1u c\u01a1 b\u1ea3n c\u1ee7a c\u00f4ng ngh\u1ec7 blockchain, gi\u00e1o d\u1ee5c c\u00e1c nh\u00e0 l\u1eadp ph\u00e1p v\u1ec1 c\u00e1ch ho\u1ea1t \u0111\u1ed9ng c\u1ee7a c\u00e1c m\u00f4 h\u00ecnh x\u00e1c th\u1ef1c kh\u00e1c nhau nh\u01b0 b\u1eb1ng ch\u1ee9ng c\u1ed5 ph\u1ea7n (PoS) v\u00e0 m\u1ed9t s\u1ed1 lo ng\u1ea1i v\u1ec1 an ninh m\u1ea1ng xung quanh c\u00e1c m\u1ea1ng blockchain, ch\u1eb3ng h\u1ea1n nh\u01b0 c\u00e1c cu\u1ed9c t\u1ea5n c\u00f4ng 51% (khi k\u1ebb t\u1ea5n c\u00f4ng ki\u1ec3m so\u00e1t 51% n\u0103ng su\u1ea5t k\u1ebf ho\u1ea1ch c\u1ee7a m\u1ea1ng, cho ph\u00e9p ch\u00fang ki\u1ec3m so\u00e1t c\u00e1c giao d\u1ecbch).<\/span><\/p>\n

M\u1ed9t s\u1ed1 nh\u00e0 l\u1eadp ph\u00e1p c\u0169ng h\u1ecfi v\u1ec1 c\u00e1c y\u1ebfu t\u1ed1 t\u00edch c\u1ef1c ho\u1eb7c ti\u00eau c\u1ef1c ngo\u00e0i \u00fd mu\u1ed1n c\u00f3 th\u1ec3 xu\u1ea5t ph\u00e1t t\u1eeb vi\u1ec7c khai th\u00e1c bitcoin.<\/span><\/p>\n

H\u1ea1 ngh\u1ecb s\u0129 Cathy Rodgers (R-Wa.), Ng\u01b0\u1eddi b\u1eaft \u0111\u1ea7u phi\u00ean \u0111i\u1ec1u tr\u1ea7n v\u1edbi b\u00e0i ph\u00e1t bi\u1ec3u l\u1ea1c \u0111\u1ec1 v\u1ec1 l\u1ea1m ph\u00e1t, COVID v\u00e0 t\u1ed5ng th\u1ed1ng Hoa K\u1ef3 hi\u1ec7n t\u1ea1i, \u0111\u00e3 h\u1ecfi v\u1ec1 ti\u1ec1m n\u0103ng c\u1ee7a blockchain \u0111\u1ec3 b\u1ea3o v\u1ec7 quy\u1ec1n ri\u00eang t\u01b0 c\u1ee7a c\u00f4ng d\u00e2n, c\u0169ng nh\u01b0 t\u00e1c \u0111\u1ed9ng ti\u00eau c\u1ef1c ti\u1ec1m \u1ea9n quy \u0111\u1ecbnh v\u1ec1 t\u0103ng tr\u01b0\u1edfng vi\u1ec7c l\u00e0m v\u00e0 \u0111\u1ea7u t\u01b0. H\u1ea1 ngh\u1ecb s\u0129 Annie Kuster (D-N.H.) \u0110\u00e3 h\u1ecfi v\u1ec1 nh\u1eefng \u0111\u1ed5i m\u1edbi c\u00f3 th\u1ec3 b\u1eaft ngu\u1ed3n t\u1eeb vi\u1ec7c khai th\u00e1c bitcoin v\u00e0 mang l\u1ea1i l\u1ee3i \u00edch cho c\u00e1c ng\u00e0nh c\u00f4ng nghi\u1ec7p kh\u00e1c.<\/span><\/p>\n

Soluna\u2019s Belizaire cho bi\u1ebft trong m\u1ed9t cu\u1ed9c ph\u1ecfng v\u1ea5n v\u1edbi CoinDesk, sau bu\u1ed5i \u0111i\u1ec1u tr\u1ea7n: \u201cT\u00f4i ngh\u0129 nh\u1eefng g\u00ec \u0111\u00e3 x\u1ea3y ra h\u00f4m nay l\u00e0, ch\u00fang t\u00f4i \u0111\u00e3 b\u1eaft \u0111\u1ea7u h\u1ecdc h\u1ecfi. \u00d4ng n\u00f3i, phi\u00ean \u0111i\u1ec1u tr\u1ea7n \u0111\u00e3 b\u1eaft \u0111\u1ea7u qu\u00e1 tr\u00ecnh h\u1ecdc h\u1ecfi \u0111\u1ed1i v\u1edbi m\u1ed9t s\u1ed1 nh\u00e0 l\u1eadp ph\u00e1p quan tr\u1ecdng nh\u1ea5t v\u1ec1 n\u0103ng l\u01b0\u1ee3ng v\u00e0 th\u01b0\u01a1ng m\u1ea1i, c\u00f3 th\u1ec3 t\u1ea1o ti\u1ec1n \u0111\u1ec1 \u0111\u1ec3 \u0111\u01b0a ra lu\u1eadt khuy\u1ebfn kh\u00edch s\u1eed d\u1ee5ng nhi\u1ec1u n\u0103ng l\u01b0\u1ee3ng xanh h\u01a1n cho ng\u00e0nh c\u00f4ng nghi\u1ec7p.<\/span><\/p>\n

\u201cT\u00f4i ngh\u0129 r\u1eb1ng th\u1eadt th\u00fa v\u1ecb khi m\u1ed9t \u1ee7y ban gi\u00e1m s\u00e1t nh\u01b0 v\u1eady th\u1ef1c s\u1ef1 \u0111\u00e0o s\u00e2u v\u00e0 t\u00ecm ra s\u1ef1 th\u1eadt v\u00e0 th\u1ef1c s\u1ef1 gi\u00e1o d\u1ee5c b\u1ea3n th\u00e2n,\u201d \u00f4ng n\u00f3i.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

C\u00e1c c\u00e2u h\u1ecfi c\u1ee7a c\u00e1c nh\u00e0 l\u1eadp ph\u00e1p tr\u1ea3i d\u00e0i t\u1eeb nh\u1eefng v\u1ea5n \u0111\u1ec1 c\u01a1…<\/p>\n","protected":false},"author":3,"featured_media":2591,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_lmt_disableupdate":"","_lmt_disable":"","_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[3,7,8,44,6],"tags":[290,66,289],"class_list":["post-2590","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-altcoins-news","category-bitcoin-news","category-blockchain","category-tin-tuc","category-quy-dinh","tag-congressional-hearing","tag-crypto","tag-environment"],"yoast_head":"\nTranh lu\u1eadn v\u1ec1 t\u00ednh hi\u1ec7u qu\u1ea3 c\u1ee7a vi\u1ec7c khai th\u00e1c ti\u1ec1n \u0111i\u1ec7n t\u1eed trong phi\u00ean \u0111i\u1ec1u tr\u1ea7n v\u1ec1 m\u00f4i tr\u01b0\u1eddng<\/title>\n<meta name=\"description\" content=\"C\u00e1c c\u00e2u h\u1ecfi c\u1ee7a c\u00e1c nh\u00e0 l\u1eadp ph\u00e1p tr\u1ea3i d\u00e0i t\u1eeb nh\u1eefng v\u1ea5n \u0111\u1ec1 c\u01a1 b\u1ea3n v\u1ec1 blockchain \u0111\u1ebfn c\u00e1c c\u00e2u h\u1ecfi v\u1ec1 c\u00e1c ngu\u1ed3n n\u0103ng l\u01b0\u1ee3ng kh\u00e1c nhau. 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