名词
中文翻译：备用频道
同义词：
['standby', 'reserve channel']
例句：
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1.The company has a standby channel for emergency communication.
该公司有一个备用通信频道用于紧急通讯。
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2.During the power outage, we had to use our standby channel to access the internet.
在停电期间，我们不得不使用备用频道来上网。
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3. The engineers were instructed to switch to the standby channel in case of any technical issues.
工程师被指示在出现技术问题时切换到备用频道。