名词
中文翻译：可见信号同义词
同义词：
['observable signal', 'detectable signal']
例句：
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1. The visible signal from the satellite wasstrong enough to be detected by the groundstation.
卫星发出的可见信号足够强，被地面站检测到。
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2. Theresearchers were able to observethe visible signal of the earthquakethrough the seismometer.
研究人员通过地震仪观察到了地震的可见信号。
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3.The invisible signal between them was too faintto be heard over the noise.
他们之间的隐形信号太微弱，无法在噪音中听到。