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。