名词
中文翻译：Unknown
同义词：
['narrow-band radio', 'narrow-band transmission例句：1. The narrow-band signal was too weak to be heard over the noise.（窄带信号太弱，无法在噪音中被听到。）2. The narrow-band signal was transmitted through a narrow beam of light.（窄带信号通过一束狭窄的光传输。）']
例句：
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1. The narrow-band signal was too weak to be heard over the noise.
窄带信号太弱，无法在噪音中被听到。
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2. The narrow-band signal was transmitted through a narrow beam of light.
窄带信号通过一束狭窄的光传输。
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3.The narrow-band signal was used for communication in remote areas where broadband is not available.
窄带信号用于偏远地区，那里宽带通信不可用。