D\u00e0n \u0111\u1ec1 chu\u1ea9n 70 s\u1ed1 \u0103n quanh n\u0103m su\u1ed1t th\u00e1ng<\/strong><\/em><\/h3>\nV\u1edbi nhi\u1ec1u ng\u01b0\u1eddi ch\u01a1i l\u00e2u n\u0103m \u0111\u00e3 qu\u00e1 quen thu\u1ed9c v\u1edbi c\u00e1c quy lu\u1eadt x\u1ed5 s\u1ed1 th\u00ec l\u1ef1a ch\u1ecdn c\u01b0\u1ee3c theo d\u00e0n \u0111\u00e3 tr\u1edf n\u00ean qu\u00e1 ph\u1ed5 bi\u1ebfn. \u0110\u00e2y \u0111\u01b0\u1ee3c hi\u1ec3u l\u00e0 c\u00e1ch b\u1eaft l\u00f4 \u0103n quanh n\u0103m d\u1ef1a theo t\u1eadp h\u1ee3p c\u00e1c gi\u1ea3i \u0111\u1eb7c bi\u1ec7t c\u00f3 t\u1ea7n su\u1ea5t xu\u1ea5t hi\u1ec7n c\u00f9ng nhau cao nh\u1ea5t. Nhi\u1ec1u cao th\u1ee7 \u0111\u00e3 t\u1eadp h\u1ee3p m\u1ed9t s\u1ed1 d\u00e0n \u0111\u1ec1 v\u1edbi quy m\u00f4 v\u00e0 s\u1ed1 l\u01b0\u1ee3ng con l\u00f4 kh\u00e1c nhau. T\u00f9y v\u00e0o ngu\u1ed3n v\u1ed1n v\u00e0 chi\u1ebfn l\u01b0\u1ee3c c\u01b0\u1ee3c m\u00e0 b\u1ea1n c\u00f3 th\u1ec3 ch\u01a1i d\u00e0n 10 s\u1ed1, 20 s\u1ed1 ho\u1eb7c th\u1eadm ch\u00ed l\u00e0 70 s\u1ed1.<\/p>\n