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在法兰克福，一位年轻有才华的嘻哈制片人在与天际线唱片公司（Skyline Records）签约时，得到了一个千载难逢的机会。但是，当唱片公司老板的黑帮兄弟从流亡中归来， 并要求分得一杯羹的时候，音乐、集团犯罪和高收入世界发生了冲突。"Is-A" refers to the "one" of one class and belongs to another class, while "Has-A" is different, which indicates that a certain role has a certain responsibility. A common reason for the wrong use of inheritance instead of aggregation is to mistakenly treat "Has-A" as "Is-A". For example:Criteria for physical examination and accreditation of flight students enrolled in civil aviationThere is still a gap with China.08　日露開戦可是无论他们怎样地寻找，却根本找不到秦思雨最近拍过什么电影或者电视剧。The newly trained classifier is compared with the previous classifier to estimate how much change has taken place. For example, you can perform a dark launch and compare two outputs over the same traffic. Alternatives include A/B testing and backtracking testing for a small portion of traffic.