何必需要浅碧深红的艳丽色彩，桂花本就是花中第一流

Childhood is a foreign country we've all visited but can't quite remember.

We are all just trying to find our way in the dark.

书是一面镜子：如果一只猿猴往里看，使徒不太可能往外看。

The ultimate goal of machine learning is to make computers learn from experience and improve their performance over time.