Hello, I'm an expert in emergency services and telecommunications. When it comes to emergency numbers, they can vary by country, but I'll provide you with a general understanding.

In many countries, 112 is a universal emergency telephone number. It's used when someone needs urgent assistance from the emergency services, which typically include police, fire, and medical services. The number can be dialed free of charge from any telephone, whether it's a landline or a mobile phone, and it doesn't require an active phone line or a SIM card to be operational.

Now, let's translate that into Chinese:

你好，我是紧急服务和电信领域的专家。当谈到紧急电话号码时，它们因国家而异，但我将为您提供一个通用的理解。

在许多国家，112 是一个通用的紧急电话号码。当有人需要紧急服务的紧急援助时，通常包括警察、消防和医疗服务，就会使用这个号码。这个号码可以从任何电话免费拨打，无论是座机还是手机，而且不需要活动电话线或SIM卡即可操作。

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"112" is the European emergency number people in distress can call 24h/24 and 7d/7 in all 28 member states of the European Union to get immediate assistance from the fire brigade, a medical team or the police. You can call the number 112 with a fixed or mobile phone. The European emergency number is free everywhere.read more >>