英語for和to的用法區別

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

以往很多年我們對於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複一次。

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

現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徵。