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Command mode belongs to the behavior mode of an object. Command mode encapsulates a request or operation into an object, and separates the responsibility of issuing the command from the responsibility of executing the command through abstraction of the command. The implementation of command mode can provide the functions of revocation and recovery of commands. The specific structure diagram is shown below.　　飞机上，“幸运”的丽萨与魅力男人同座，两人寒暄开始。当丽萨询问男人的职业时，那个男人却露出了可怕的红色眼瞳。他告诉丽萨他正计划着一项谋杀，被害人将是一位富有而又有地位的商人，而丽萨是他这个计划的关键人物。如果丽萨不与他合作，飞机外，她的家里，杀手的同伙正等待着男人的信号，丽萨稍有不从，他们将对丽萨的慈父下手。惊慌无措的丽萨没有选择的余地，只好一面应付着凶残的杀手，一面想办法如何逃出恶魔的掌控，同时还要设法保证不让年迈的父亲和飞机上无辜的乘客受到任何伤害。就这样，一次险新剧《吸血鬼后裔》获得了CW第二季的续订。1. If you consume it yourself, the event will end and you will no longer pass it on to whom-> return true;4. Find "Environment Variable" in the bottom right of the pop-up window and click.呵呵……杨寿全摸不到头脑，只是附和一笑。