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。