The year 1687 saw the publication of Newton’s great book The Mathematical Principles of Natural Philosophy. 译文：一六八七年看到了牛顿的巨著《自然哲学的数学原理》的问世。

问答题An American officer slipped on a banana skin.译文：一个美国军官滑倒在香蕉皮上。

问答题From the evaporation of water people know that liquids can turn into gases under certain condition.译文：人们从水的蒸发了解到，液体在一定条件下能变成气体。

问答题When it is dark in the east, it is light in the west；when things are dark in the south, there is still light in the north.译文：当东方黑暗的时候，西方是亮的；当南方黑暗的时候，北方依然有光亮。

问答题If winter comes, can spring be far behind译文：如果冬天来了，那么春天还会远吗

问答题In the summer of 1969, the administration publicly urged an easing of tensions with China.译文：在1969年夏天，政府公开主张缓和同中国的紧张。