唯有丑女或绝世美女才会遮掩自己的面容。

企业的目的是改善人们的生活。

The challenge of our time is to build an economy that works for everyone, not just the privileged few.

The hours of folly are measured by the clock, but of wisdom: no clock can measure.

每个数学问题都有解答；挑战在于找到它。