名词
中文翻译：回音
同义词：
['echo', 'reverberation']
例句：
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1.The sound of the waves back toward shore is a beautiful backward echo.
海浪向岸边的回音是一道美丽的风景。
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2.The teacher asked us to listen carefully and try to understand the backward echo in the classroom.
老师要求我们仔细听，并试图理解教室里传来的回声。
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3. The artist used a special technique to create a backward echo that seemed to come from nowhere.
这位艺术家使用了特殊的技巧，创造出一种似乎来自任何地方的回音。