形容词
中文翻译：无辐射的
同义词：
['wireless', 'radio-free', 'silent']
例句：
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1. The device is designed to be radiofree for the entire family.
该设备设计为全家人都能使用的无线电静默设备。
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2. The area was declared radiofree after the bombing.
在轰炸后，该地区被宣布为无线电静默区。
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3. The scientists are working on a project that aims to create a radiofree zone in the city.
科学家们正在致力于一个项目，旨在为城市创造一个无线电静默区。