每张皮革都有潜力，我们的责任是负责任地发掘它。
Every hide carries potential; our job is to reveal it responsibly.
教室是更大社会的缩影，因此，它是关于意义、身份和权力的斗争场所。
A good system design is one that makes it easy to do the right thing and hard to do the wrong thing.
一个好的系统设计是使做正确的事情变得容易，做错误的事情变得困难。