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

林業中的短期收益往往會導致長期痛苦。

The writer is the enemy of all dictatorships, whether of the left or of the right.

Happiness and unhappiness depend upon the opinion we have of things.

Science is a journey, not a destination.

A mathematician's work is mostly a solitary pursuit, but it builds on the work of many others.

沒有什么比現實本身更魔幻。

文學的力量在于它能夠讓我們以不同的方式看待世界。

可持續性不是一種選擇；它是能源行業的必需品。