名词
中文翻译：空心脉冲
同义词：
['hollow signal', 'hollow echo', 'hollow transmission']
例句：
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1.The hollow pulse of the wind through the trees made a soothing sound.
风吹过树林时产生的空心脉冲声令人感到宁静。
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2.The hollow pulse of the music was so deep that it seemed to resonate throughout the room.
音乐的空心脉冲如此深沉，以至于在整个房间中回荡。
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3.The hollow pulse of the heartbeat could be heard from across the room.
从房间的另一边可以听到心脏的空心脉冲声。