你必须为梦想而奋斗。你必须为之牺牲并努力工作。
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。
Don’t say anything about someone in email you would not be comfortable saying to them directly, because eventually they will read it.