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"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:8. The signals specified in this article are not signals for the ship to call for help in distress. Signals for distress of ships are set out in Appendix 4 to these Rules.在新一季中，Quentin以及朋友将开启一场魔法世界的革命。斯黛拉·麦薇（Stella Maeve）、奥利维亚·泰勒·达德利（Olivia Taylor Dudley）、哈尔·阿普尔曼（Hale Appleman）、阿俊·古普塔（Arjun Gupta）、莎莫·比施尔（Summer Bishil）、里克·沃尔斯（Rick Worthy）、崔佛·艾因霍恩（Trevor Einhorn）和布莱特妮·柯伦（Brittany Curran）等都有望继续回归。Flight MH370 was carrying 227 passengers (153 from mainland China and 1 from Taiwan) and 12 crew members. All 239 passengers and crew on board were killed.(未完待续……) show_style();。　　12年前，在与邻国·巴尔特兰帝国之间的战争中失去母亲的玛法姆特，　　老苦瓜性格古怪孤癖，脾气暴躁，没有人愿意和他为伍，接近他。没有人知道他的真实姓名和过去。初时，老苦瓜尽办法摆脱这个“傻子”，却每每失败。