But who prays for Satan? Who, in eighteencenturies, has had the common humanity to pray for the one sinner that needed it most?（From Jane Lampton Clemens）

Life is an adventure, and every challenge is an opportunity to grow.

这类波可以像光波一样被反射、折射和偏振。

Theorems are eternal; their proofs are ephemeral.

永远不要停止学习——世界一直在变化。

科学不仅仅是事实的集合；它是一种思考方式。

What can be said at all can be said clearly; and whereof one cannot speak thereof one must be silent.

生命周期假说认为，个人会在一生中规划其消费和储蓄行为。