You'd better look sharp or you'll be late.

你得快点，不然就迟到了。

《牛津词典》

You'd better look up the dictionary when you meet the new words.

遇到新单词时，你最好查一下字典。

youdao

Before you choose a book, you'd better look through the first few pages to know whether it is too easy or too difficult for you.

在你选书之前。你最好把前几页通读一遍，看看它对你来说是太容易还是太难了。

youdao