名词
中文翻译：不稳定的回音
同义词：
['unstable echo', 'unsteadyecho']
例句：
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1. The soundof the waves reverberated throughthe cave.
海浪的声音在洞穴中回荡。
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2. The old house had a hauntingly familiar echo.
这所老房子有一种令人不安的熟悉回声。
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3. Themusic was so loud thatit caused a disconcerting echo throughout the room.
音乐太响了，整个房间都回荡着令人不安的回声。