1. They overcome their difficulty by working hard.
   他们通过努力工作的办法来克服困难
2. He is working hard at this thesis.
   他正在努力地撰写论文。
3. Working without stint.
   无限制地工作
4. They are hard - working farmers .
   他们是勤奋工作的农民。
5. Let's stop working and relax for an hour.
   我们停工休息一小时吧。

　2个名词解释