不光染丝是这样，国家也会被染。 

Sustainability isn't an option—it's our responsibility to future generations.

疯狂起来狂野起来

数学中最重要的是理解概念，而不仅仅是记忆公式。

The greatest risk is not taking one.

每一本书都是一次旅程，而每一次旅程都是一本书。