trypetid

例句：

1. 1. The scientisttried to solve the problem by using differentmethods.
   科学家试图通过使用不同的方法来解决这个问题。
2. 2. The engineer tested the new machine beforeit was put into use.
   工程师在机器投入使用前对其进行了测试。
3. 3. Theytried their best to winthe championship.
   他们尽最大努力赢得冠军。