Hello, I'm an expert in emergency services and public safety. In the United States, the number 911 is universally recognized as the emergency telephone number. When someone dials 911, they are connected to an emergency dispatcher who can send police, fire, or medical assistance to the scene of an emergency. The system was first introduced in 1968 and has since become a critical part of the response infrastructure for emergencies.

Now, let's translate that into Chinese:

你好，我是紧急服务和公共安全领域的专家。在美国，911 是公认的紧急电话号码。当有人拨打 911 时，他们会连接到紧急调度员，调度员可以派遣警察、消防或医疗援助到紧急情况现场。该系统最早于1968年引入，自此成为紧急情况响应基础设施的关键部分。

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Definition. 911. Emergency Services Phone Number (United States and Canada) 911. September 11, 2001 (World Trade Center/Pentagon terrorism attacks)read more >>