I'm not going to let them get one over on me!

　　我決不讓他們勝過我！

　　Now let me see ─ how old is she now?

　　讓我想一想，她現在多大了呢？

　　Let's take the problems in a different order.

　　咱們換一個順序來處理這些問題吧。

　　Let's be practical and work out the cost first.

　　咱們實際一點兒，先計算一下成本費用。

　　Let's attack one problem at a time.

　　咱們一次全力處理一個問題。

　　It is important not to let things get out of perspective.

　　重要的是不要把事情輕重倒置。