名词中文翻译
中文翻译：永久回音
同义词：
['eternal echo', 'permanent reverberation']
例句：
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1.The sound of the waterfall was a perpetual echo in the valley.
瀑布的声音在山谷中回荡，永无止境。
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2.The old house still has that perpetual echo of its past inhabitants.
那所旧房子仍然有它过去居民的永恒回响。
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3. The music had a perpetual echo in his mind, haunting him even after he left the room.
音乐在他脑海中回荡，即使在他离开房间后也一直困扰着他。