Let's get to the point.

让我们来谈要点。

I can't imagine why.

我想不通为什么。

Don't bury your head in the sand.

不要逃避现实。

After forty years teaching English he thinks it's time to call it a day.

他教英语四十年，认为该退休了。

This is a very bad performance.

这是一次非常糟糕的演出。

His thinking is behind the times.

他的想法赶不上时代。