光的理论实际上是弹性介质振动的理论。
To help people save more, make saving the default option.
不学习历史的人注定要重复错误。
Get into a rut early: Do the same process the same way. Accumulate idioms. Standardize. The only difference(!) between Shakespeare and you was the size of his idiom list - not the size of his vocabulary.