网球是一项需要你在心理和身体上都强大的运动，但心理部分更为重要。
"Tennis is a sport where you have to be strong mentally and physically, but the mental part is even more important."
The past is always present, and the present is always past.
我唯一的竞争对手是我自己。
In the end, the value of a theory is not in its complexity, but in its ability to explain and predict.
对验证的渴望是可以理解的，但不能总是得到满足。
Behavior is not just a reaction, it's a communication.
There are only two tragedies in life: one is not getting what one wants and the other is getting it.
生活里有两个悲剧：一个是没有得到我们想要的；另外一个是得到了。