H\u01b0\u1edbng d\u1eabn c\u00e1ch soi c\u1ea7u l\u00f4 \u0111\u1ec1 v\u1edbi b\u1ea1ch th\u1ee7 l\u00f4<\/h2>\n
B\u1ea1ch th\u1ee7 l\u00f4 l\u00e0 c\u1ee5m t\u1eeb r\u1ea5t quen thu\u1ed9c v\u1edbi nh\u1eefng ng\u01b0\u1eddi ch\u01a1i th\u01b0\u1eddng xuy\u00ean ti\u1ebfp x\u00fac v\u1edbi l\u00f4 \u0111\u1ec1. \u0110\u00e2y l\u00e0 m\u1ed9t d\u1ea1ng \u0111\u00e1nh l\u00f4 \u0111\u01b0\u1ee3c r\u1ea5t nhi\u1ec1u ng\u01b0\u1eddi theo \u0111u\u1ed5i. \u01afu \u0111i\u1ec3m c\u1ee7a h\u00ecnh th\u1ee9c n\u00e0y l\u00e0 ng\u01b0\u1eddi ch\u01a1i s\u1ebd kh\u00f4ng c\u1ea7n b\u1ecf nhi\u1ec1u v\u1ed1n hay nu\u00f4i nhi\u1ec1u s\u1ed1. V\u00e0 \u0111\u1eb7c bi\u1ec7t, m\u1ed9t khi l\u00f4 b\u1ea1ch th\u1ee7 xu\u1ea5t hi\u1ec7n th\u00ec t\u1ef7 l\u1ec7 chi\u1ebfn th\u1eafng s\u1ebd l\u00ean \u0111\u1ebfn 90%. Trong 10% c\u00f2n l\u1ea1i ch\u1ec9 c\u00f3 2% b\u1ecb tr\u01b0\u1ee3t, 8% c\u00f2n l\u1ea1i l\u00e0 b\u1ecb l\u1ed9n.<\/p>\n
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