有一个人从天堂来到人间旅游，他所使用的是有效三十天的减价票，他试图要把他的回程票卖掉。
Ingersoll's story of the man that went down from heaven on a reduced-rate excursion ticket good for 30 days --- and tried to sell his return ticket.
我们从这样的假设开始：任何学科都可以以某种智力上诚实的形式有效地教给处于任何发展阶段的任何孩子。
The beauty of mathematics lies in its ability to describe the universe in a language that is both precise and universal.
We need to reshape our own perception of how we view ourselves. We have to step up as women and take the lead.
The night does not hide the world; it reveals another one.
