名词
中文翻译：类
同义词：
['class A', 'class A zone']
例句：
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1. The class A signal area is the first level of communication for emergency vehicles.
类A信号区是紧急车辆的第一级通信区域。
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2. The class A signal area is used to indicate a specific area where communication is restricted.
类A信号区用于指示一个特定的通信受限区域。
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3. In this class A signal area, all communications are monitored and controlled by security personnel.
在这个类A信号区内，所有通信都由安保人员监控和控制。