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假如用户遇到了紧急情况并用手机呼救,却说不清或来不及说自己的位置,救援人员就不知道该去哪里救援,从而延误救援时间。
If the user encountered an emergency situation and called for help with a cell phone, but could not tell or too late to say his position, rescue workers do not know where to go to rescue, thus delay rescue time.