在处理递归时，Haskell有两大优势：Haskell优化了尾部递归，Haskell是惰性的。
Haskell has two primary advantages when dealing with recursion: Haskell optimizes tail recursion, and Haskell is lazy.
紧急事故处理人员花了近1小时搜寻落水车辆，落水点就在坡道尾部。
Emergency responders searched for about an hour before finding the vehicle, submerged at the end of the ramp.
人们需对这些尾部极端事件做出精确的判断和预测，这就需要寻求更加适合的模型方法来处理这些极端情况。
If people want to make accurate judgment and prognosticate to these tail extreme events, we need to find a more suitable model which deals with these extreme cases.
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