For years we had little knowledge of what life was like inside China.
以往很多年我们对于中国国内的生活情况所知甚少。
It was a time of peak demand for the product.
那是对该产品需求最旺的时期。
There was much discussion about the reasons for the failure.
就失败的`原因进行了大量的讨论。
The treatment should be repeated every two to three hours.
这种治疗方法应该每隔两到三小时重复一次。
Now she won't have to go out to work any more.
现在她不必再出去工作了。
The need to communicate is a key characteristic of human society.
需要交流是人类社会最重要的一个特征。