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如标题，求使用什么事件
@我叫做HF是我 用创建实例动作就行了，创建的坐标利用random表达式来随机，例如随机在x坐标0到500，y坐标200到700的区域创建怪物，x坐标和y坐标就分别填random(0,500)和random(200,700)
