自然的统一性不是一个事实，而是一项任务。

The spread of liberal democracy and the integration of the world economy have created a situation in which the major powers are no longer willing to risk war with one another.

Every piece of plastic we don't recycle is a failure of our system and our responsibility.

The best way to predict the future is to create it.

过去从未真正过去；它活在我们的故事和骨血里。