weak的副词形式是什么

　　weak句子示例

　　He became very weak towards the end of his life.

　　他临终时很虚弱。

　　He was a weak little mouse of a man.

　　他是个懦弱无能的.人。

　　I was always weak in the science subjects.

　　我总是学不好理科。

　　That bridge is too weak for heavy traffic.

　　那座桥不太牢固，承受不住过多的车辆。

　　The unions have always been weak in this industry.

　　在这个行业，工会一直没有权威。