pull their weight

• vi. 划船时有效地利用自己的重量

pull their weight的用法和样例：

例句

1. As the Council on Competitiveness recently noted, some of the700 Federal Laboratories are not pulling their weight and need to be shut down.
   美国竞争力咨讯会最近指出，700个联邦试验所之中有些未能发生作用，应予关闭。