If everything was perfect, you would never learn and you would never grow.

Two possibilities exist: either we are alone in the Universe or we are not. Both are equally terrifying.

地球是广阔宇宙舞台上一个非常小的舞台。

"The essence of mathematics lies in its freedom."

现在生活中，没有什么可比一句好的陈词滥调，更能营造出四海一家亲的效果。