Legal obligations are not merely moral obligations backed by sanctions.

做数学的艺术在于找到包含所有普遍性萌芽的特殊情况。

The world is so full of people, so crowded with these miracles, that they become commonplace and we forget.

科学的进步是人类集体努力的结果。

虽然触觉遍布在全身的表皮上，但是我们往往给予孩子的活动却局限于的部分。

Challenges are opportunities in disguise. Embrace them, and you’ll find growth where others see obstacles.

沉默并不总是智慧的标志，但喋喋不休总是愚蠢的标志。