你不能因为某件事困难就放弃。
反馈是鲁棒控制系统的关键。
The most alluring thing a woman can have is confidence.
求学的人必须先立下志向。志向确立后，学问就可以按部就班地下功夫。
A man's work is nothing but this slow trek to rediscover, through the detours of art, those two or three great and simple images in whose presence his heart first opened.