Trade between two countries can be mutually beneficial, even if one of them is less efficient in the production of all commodities.
"The universe is a big place, and sometimes you have to make your own rules."
Lisp is worth learning for the profound enlightenment experience you will have when you finally get it; that experience will make you a better programmer for the rest of your days, even if you never actually use Lisp itself a lot.
模糊集的概念提供了一种自然的方式来处理那些不精确性源于缺乏明确定义的类别成员标准的问题。