量化宽松的问题在于它在实践中有效，但在理论上却行不通。
The problem with quantitative easing is that it works in practice but it doesn't work in theory.
太阳在天空中闪耀，眼前没有一片云彩。
The most important thing I have learned is that the best way to get something done is to begin.
You can't control what you don't measure.
文学不仅仅是记录历史，它还能够塑造未来。
PID控制器是控制工程师的通用工具，适用于各种各样的过程。
被世人称为不道德的书，其实是揭示了世界自身的羞耻。