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Imagine a scene where there is an electric lamp with only one switch on it. When the light is on, press the switch at this time and the light will switch to the off state. Press the switch again and the light will be turned on again. The behavior of the same switch button is different in different states.你在下塘集多安置些人，盯紧他那些随从。影片开始于一个平静的夜晚与一次普通的采访，安吉拉·韦多是一名电视台的记者，她这回的采访任务是制作一期关注洛杉矶某消防局夜间行动的节目。因为节目任务并不繁重，所以她就仅与一名摄影师只身前往。自然他们在消防局中受到了消防队的热烈欢迎，并且和消防队员们度过了相当愉快的一段时光，但这样洋溢着美好气氛的采访活动被一个普通的911电话打断了。不过对于要做节目的安吉拉来说却异常兴奋，毕竟能够随同消防员进行夜间出巡是绝佳的节目素材，于是两人便坐上了消防车与几位消防员一同出发了。　　然而威廉他们很快发现，此次任务绝非如此简单，他们前行的路上充满凶险……如果知道我秘密的唯一朋友转到我们班来?…First of all, the cost of obtaining customers on a large scale remains high. Although parents' awareness of online learning has improved significantly due to the market for online children's English, parents' trust in online learning still needs to be improved.