The ruling ideas of each age have ever been the ideas of its ruling class.

我不害怕独自走在这个世界上。

And let's be clear: It's not enough just to limit ads for foods that aren't healthy. It's also going to be critical to increase marketing for foods that are healthy.

化学的语言是普遍的，它的符号被所有国家理解。

水产养殖的效率不在于生产更多，而在于浪费更少。

建筑中最困难的事情是保持简单。