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Another expression of the minimum knowledge principle is to communicate only with direct friends. As long as there is a coupling relationship between classes, it is called a friend relationship. Coupling is divided into dependency, association, aggregation, combination, etc. We call classes that appear as member variables, method parameters, and method return values direct friends. Local variables and temporary variables are not direct friends. We require unfamiliar classes not to appear in the class as local variables.After saying this passage, Zhao Mingkai's eyes looked at the light in the interview room and fell into a silence. I knew that he was thinking of sad things. He tentatively asked him how Zhou Xiaolin was doing later. He sighed deeply and said with a regretful tone:秀爱在剧中饰演拥有出色爆发力和危机应对能力、无论何事都能解决得非常利落的空姐洪娜璃，是一个虽然在飞机上以强势的一面示人，但下班后却反转一面的可爱人物。FBI深度卧底组（Deep Cover Operations，简称D.C.O.）特工Martin Odum（Sean Bean）拥有超出常人想象的适应能力——无论执行任何任务，他都能完美地将自己「转化」成不同的人，从而成功混入敌人内部。然而一个神秘的陌生人声称Odum并 不是真正的Odum，令Odum开始质疑自己的真实身份，整个事件变得扑朔迷离。前日项羽露出责怪神色时，他便有离开彭城散心的想法。等现场只剩下三名敌军的时候，她实在忍不住了，长腿一弹，跃入战圈。At the beginning, it was said: "As soon as we were born, we were in an old world. There were many rules of the game to abide by, otherwise we would be out of the game. How to live is always the subject of living."