For years we had little knowledge of what life was like inside China.

　　以往很多年我們對于中國國內的生活情況所知甚少。

　　It was a time of peak demand for the product.

　　那是對該產(chǎn)品需求最旺的時期。

　　There was much discussion about the reasons for the failure.

　　就失敗的原因進行了大量的討論。

　　The treatment should be repeated every two to three hours.

　　這種治療方法應該每隔兩到三小時重復一次。

　　Now she won't have to go out to work any more.

　　現(xiàn)在她不必再出去工作了。

　　The need to communicate is a key characteristic of human society.

　　需要交流是人類社會最重要的一個特征。