数学不是一项观赏性运动。
We’ve been through a lot together, and the bond we have is unbreakable.
可持续性不仅仅是植树;它是为了正确的理由在正确的地方种植正确的树木。
It is not what we believe, but why we believe it; moral responsibility begins there.  
To understand the mind, we must first understand its evolutionary purpose.