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Answer: The similarity of these three modes is that they all serve as an intermediate layer between the client and the real used class or system, which plays the role of allowing the client to indirectly call the real class. The difference is that the application occasions and intentions are different.　　为了躲避种种烦扰，袁晶同意接拍此戏，带着乔凉连同摄制组赶赴安徽泾县某个古老的小村拍摄。在这一过程中，袁晶不仅承受巨大的拍摄压力，而且恐怖如影随形，不曾退去……随即目光落在了赵王歇脸上，韩信的眼神之中也多了几分凝重……(未完待续。Class has only one instance. Q: How can we guarantee it? Answer: Private constructors are used to ensure that classes cannot be instantiated outside the class.A device with a firewall or proxy can buffer SYN flooding attacks in the network in two ways, one is to disguise SYN-ACK packets for the connection initiator, and the other is to disguise ACK packets for the server [5].为了我？田市不由的冷笑一声丈夫失踪后，玛丽亚·路易莎（Maria Luiza）违抗了她通常保守的举止，开设了Bossa Nova俱乐部。