例句：

　　He became very weak towards the end of his life.

　　他臨終時(shí)很虛弱。

　　He was a weak little mouse of a man.

　　他是個(gè)懦弱無(wú)能的人。

　　I was always weak in the science subjects.

　　我總是學(xué)不好理科。