名词
中文翻译：国际呼号
同义词：
['international signal', 'international code']
例句：
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1. The international call sign for the emergency number is "911".
紧急号码的国际呼号是“911”。
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2. They used a new international call sign to communicate with their colleagues in another country.
他们使用一个新的国际呼号与另一个国家的同事们进行沟通。
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3. When they received the international call sign, they knew it wastime to act.
当他们收到国际呼号时，就知道该采取行动了。