名词
中文翻译：初级频率区
同义词：
['primary frequency range', 'primary frequency band']
例句：
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1. The primary frequency zone for this device is between 300 MHz and 400 MHz.
该设备的初级频率区间是300兆赫到400兆赫。
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2. In the primary frequency zone, the signal strength is weaker.
在初级频率区，信号强度较弱。
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3. The primary frequency zone is where most of the signals are concentrated.
初级频率区是大多数信号集中的地方。