名词短语
中文翻译：背包式发射机
同义词：
['backpack radio', 'backpack transmitter']
例句：
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1.The backpack transmitter was used to communicate over long distances.
背包式发射机被用来进行远距离通信。
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2. The backpack transmitter was the only way to stay connected during emergencies.
背包式发射机是紧急情况下保持联系的唯一方式。
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3. The backpack transmitter was a popular choice for hikers who wanted to keep their devices charged.
背包式发射机是徒步旅行者喜欢选择的设备，因为它可以让他们保持设备充电。