例句：

　　He explained who each person in the photo was.

　　他對(duì)照片里的`人一一作了介紹。

　　Can you explain how the email system works?

　　你能說(shuō)明一下電子郵件系統(tǒng)的工作原理嗎？

　　She tried to explain but he wouldn't listen.

　　她試圖說(shuō)明一下原因，可他根本不聽。