If you don't make mistakes, you're not trying hard enough.
如果你不犯错，说明你不够努力。
By used books. They have the same words as the new ones. Also libraries.
我父亲总是教导我：关心和分享。这就是我们举办公开课的原因。我唯一能做的就是尝试回馈。
"A story is not a line; it is a web."
The mining industry has a responsibility to leave communities better than we found them.
The only thing necessary for the triumph of evil is for good men to do nothing.