名词
中文翻译：回声
同义词：
['echo', 'reverberation']
例句：
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1.The sound of the waves back echoed across the beach.
海浪的声音在沙滩上回荡。
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2. The old house still hasa strong echo in the mornings.
这座老房子早上仍然回响着。
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3. Themusic was so loud that it could beheard back echoing through the halls.
音乐声太响了，可以听到它通过大厅的回声。