"Know forwards and backwards" nghĩa là gì?


"Know sth forward and backward" = biết ngược biết xuôi -> nghĩa là rất am hiểu chủ đề, lĩnh vực cụ thể (sách, phim, nhạc).

Ví dụ 
She has read this book so many times, she knows it backwards and forwards.

You should ask Andre about the issue—he knows car engines backwards and forwards.

We ourselves know it backwards and forwards: every year we participate in helping foster (bồi dưỡng) the Vietnamese team to compete at the International Astronomy (Thiên văn học) and Astrophysics (Vật lý thiên văn) Olympiads. It is a pleasure to be able to contribute to training such strong students. But when we asked about their next aspirations, all answered unanimously that they wanted to study abroad.

Thùy Dương

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