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Attackers can use a large number of controlled machines to establish a large number of TCP connections with Target, making it unable to accept normal TCP connection requests, thus achieving the purpose of denial of service attacks.一部黑人歌舞音乐片，关于大萧条时期南方一家非法经营的酒吧。Title Category:2026年，地球环境恶化，人类陷入重大生态危机。林业局、国土资源局等相关部门高度重视，接上级指示，环保基地决定挑选一批优秀成员组成飞龙环保队，寻找方法阻止环境进一步恶化。队伍由五位年轻人组成：队长炽焰、智囊深蓝、体育高手铁拳、少女Maggie和电脑天才小星。他们历经千难万险，阻止了幕后黑手--邪恶科学家“魔尊”的阴谋，使生态环境恢复了正常，地球回复往日的平静。队员们回到基地，继续为保卫地球生态环境而努力。　　Ursula在每一段新生活中努力寻找着正确的前进方向。她度过了历史长河中的一段关键时期，经历了两次世界大战，一场与希特勒的邂逅，以及诸多重大的人生事件。但Ursula如此迫切地需要活下去的原因是什么？The next four patterns, including this pattern, are all the relationships between classes and do not involve inheritance. When learning, you should remember induction and the diagram at the beginning of this article. The observer mode is well understood, similar to email subscription and RSS subscription. When we browse some blogs or wikis, we often see RSS icons. This means that when you subscribe to the article, you will be notified in time if there are subsequent updates. In fact, in a nutshell, when an object changes, other objects that depend on the object will be notified and will change with it! Objects are a one-to-many relationship. Let's look at the diagram first: