And when they leave,they take your life of details with them. You are expected to move on again, but you don't remember what it was that moved you, because no one's asked you in so long. Not even yourself.

我们站在巨人的肩膀上，他们首先将地球想象为一个动态系统。

天然气作为清洁能源，将在我国能源结构调整中发挥重要作用。

希望是美好的，也许是人间至善，而美好的事物永不消逝。

释义：做事情必须踏踏实实，不要追求浮华的虚名。

Mathematics is a living, breathing discipline, constantly evolving with new ideas.