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Compared with the distributed denial of service attack that directly forges the source address, the reflection attack is more difficult to trace the source of the attack due to the addition of a reflection step. However, this is not the real threat of the reflection attack, and the real threat lies in the amplification attack using the reflection principle.2018-03-02 17:42:49"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:瑞士导演弗里德里克·麦蒙（ Frédéric Mermoud）擅长执导恐怖片，他执导的惊悚题材电视剧《魂归故里》曾在法国大获成功。他的最新电影《摩卡》依然是关于一个犯罪的故事。艾曼纽·德芙（Emmanuelle Devos）饰演的Diane，儿子在一场交通事故中离世，而肇事司机逃逸。 
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