让中国人吃饱饭是我们这代科学家的使命。
It is our mission as scientists of this generation to ensure Chinese people have enough to eat.
The poet is a man who puts up a ladder to a star and climbs it while playing a violin.
一个个都说∶我是向上效法了尧、舜、夏禹、商汤、周文王、周武王的大道。”但所说的话却是互相攻击的，所行的事是截然相反的。
中心地的等级反映了所提供的商品和服务的等级。