生活的悲剧不是美好的事物早逝,而是它们变老和变得卑鄙。
No man's knowledge here can go beyond his experience.
未来能源结构将是多元化的,煤炭行业需要找准自己的定位。
别逼我,我已经在悬崖边上了。
Mathematics is not about numbers, equations, computations, or algorithms: it is about understanding.