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

農業的可持續性不是一種選擇，而是生存的必需。

I'm mentioning all this -- I'm mentioning all this because I think this is not merely a personal problem; you may think I'm wrong in this, but I think we live in an age when our lives are regularly punctuated by career crises, by moments when what we thought we knew -- about our lives, about our careers -- comes into contact with a threatening sort of reality.

寫作就是活兩次。

所以,在收成好的年頭,百姓就仁義善良；遇到荒年,那么百姓也會吝嗇而兇惡。

流放不是地點，而是一種狀態。

科學界必須共同努力應對全球性挑戰。