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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.吕雉知道眼前这人对夫君和儿子有着怎样的意义，因此表现的十分客气。It is understood that a Mate20 X5G mobile phone released by Huawei, which costs 6,199 yuan, will be officially launched on August 16."Can afford to lose" seems to be a low profile, but in fact it is not easy to do it. What can really afford to lose is either young enough or has a sufficient reserve of resources. This is often a paradox in investment. The more you can afford to lose, the better your mentality will be, and the less likely your behavior will be to deviate. On the contrary, the more you can't afford to lose, the more you want to gamble and turn over the big ones as soon as possible. Without jumping this psychological trap, it is difficult to really form an investment consciousness.《我们这一班》强纳森虽然才年仅12岁，但却已经住过了6个寄宿学校……他最后的机会是去以男孩唱诗班闻名全球的『汤玛士学院』－对强纳森而言，再也没有比这里更好的地方了！强纳森很快地跟他在『汤玛士学院』的室友们变成好朋友，他们带强纳森去他们的秘密基地「一个废弃的公车」。《乌龙小子》以海上丝绸之路为背景，以现代化高科技手段，用拟人化形式，讲述象征和平友谊的中国茶文化和茶文化历尽艰险传播到世界各地的不凡历程，通过一个个生动、诙谐、惊险的小故事，串联起一部意蕴深刻的现代版童话剧，让青少年在娱乐中认识中国传统茶文化的渊源和精髓。