House Speaker Nancy Pelosi then threw a curve.

之后众议院议长南希·佩洛西的讲话令人们捉摸不透。

But a person who threw a curve ball did something unexpected.

一个人curve ball，那么这人就做出了意想不到的事情。

Another expression that we get from baseball, and there are lots of them, is to throw a curve ball.

我们从棒球中得到的另一种表达方式是投出弧线球，这种表达方式有很多。