To be natural is such a very difficult pose to keep.

Topology is the study of the properties of a figure that are unchanged by any deformation.

历史不仅仅是关于过去；它是关于过去如何塑造现在。

恐惧风险的本能，反而让穷人承担更大风险。

拥有好主意的最好方法就是拥有很多主意。

我相信要想成功，就必须愿意做出牺牲。