1. He signed on as a sailor.
   他签约受雇为船员。
2. I tried hard not to betray signs of grief on my face.
   我竭力不在脸上显露出悲痛的表情。
3. There is no sign that the economy is on the upturn.
   没有任何迹象表明经济会好转。
4. I signed the document on your behalf.
   我代表你签署了该文件。
5. The lawyer can sign the papers on my behalf.
   律师可以代表我签文件。

　1个动词解释