数学的快乐来自于为理解而奋斗。

It's probably as unlikely that you would nowadays become as rich and famous as Bill Gates, as it was unlikely in the17th century that you would accede to the ranks of the French aristocracy. But the point is, it doesn't feel that way. It's made to feel, by magazines and other media outlets, that if you've got energy, a few bright ideas about technology, a garage -- you, too, could start a major thing.

在可持续捕捞实践中的创新是平衡经济增长和环境保护的关键。

Free education is abundant, all over the Internet. It's the desire to learn that's scarce.