当现有约束被改变以允许更有效的经济活动组织时,经济增长就会发生。
I'm very passionate about what I do, and I think that's important.
The world is a book, and those who do not travel read only one page.
记忆是脆弱的,但它也是我们理解过去最强大的工具。
The signal of human influence on climate has emerged from the noise of natural variability.