名词
中文翻译：空白信号
同义词：
['blank tone', 'silence']
例句：
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1.The radio was transmitting a blank signal.
收音机正在发送一个空白信号。
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2. The pilot received a blank signal from the ground.
飞行员从地面收到了一个空白信号。
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3. The car's engine died and it sent out a blank signal.
汽车的引擎熄火了，它发出了一个空白信号。