weak的名词形式

weak名词形式为weakness

例句如下，请你仔细体会和理解吧

1、

He became very weak towards the end of his life.

他临终时很虚弱。

2、

He was a weak little mouse of a man.

他是个懦弱无能的人。

3、

I was always weak in the science subjects.

我总是学不好理科。