The only way to learn a new programming language is by writing programs in it.

研究明史需要全面理解其独特的社会结构和文化背景。

But it is the same with man as with the tree. The more he seeks to rise into the height and light, the more vigorously do his roots struggle earthword, downword, into the dark, the deep - into evil.

Safety isn't just a policy, it's a culture that starts at the top.