色多多在线观看播放-色多多在线观看高清免费-色多多在线观看视频-色多多在线看-欧美aaaaa性bbbbb小妇-欧美aaaav免费大片

我不會為任何人游泳。我是為自己游泳。

數學不是沿著一條清理得很好的高速公路小心行進，而是進入一個陌生的荒野的旅程，探險者常常會迷路。

The chemical industry is the backbone of modern civilization, and we must treat it with the respect and responsibility it deserves.

The past is always tense, the future perfect.

True freedom is not about doing what you want, but about not doing what you don't want to do.

學習一門新編程語言的最好方法是用它寫程序。

The arithmetic of L-functions is a key to unlocking the secrets of number theory.

挑戰在于在建筑環境與自然世界之間創造和諧。