精品无码久久久久久国产_成人午夜在线视频一区_亚洲最大的av网站_亚洲欧美综合区自拍另类_91精品国产一区_日韩精品中文在线观看_一道本无吗dⅴd在线播放一区_国产精品旅馆在线_欧美午夜久久久_亚洲自拍在线观看_黑人精品xxx一区一二区_亚洲精品日韩久久久_在线视频一区二区_国产欧美久久一区二区_中文字幕精品在线视频_成人欧美在线观看

Sustainability is not an option; it's a responsibility we owe to future generations.

Nature has placed mankind under the governance of two sovereign masters， pain and pleasure.

The anarchic nature of the international system means that states must rely on self-help to ensure their survival.

做出偉大工作的唯一方法是熱愛你所做的事。

如果你想有所作為，就必須愿意承擔(dān)風(fēng)險(xiǎn)。