则天下所谓可者，未必然也。
天下很多所谓可以做的事情，未必都是可以做的啊！
对幼儿来说，妈妈的声音是具有特殊意义的参照物。
Every performance, I treat it as the last one.
Wise men talk because they have something to say; fools, becasue they have to say something.
"The principles of a free society are essential for human progress and prosperity."
何必需要浅碧深红的艳丽色彩，桂花本就是花中第一流
在电子领域，精确不是奢侈品——它是信任的基础。