名词
中文翻译：未解决的回声
同义词：
['unanswered echo', 'unresolvedsound']
例句：
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1. The unresolved echo of the past hauntsus every day.
过去未解之谜每天困扰着我们。
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2. The unresolved echoof the past haunts us every day.
过去未解之谜每天困扰着我们。
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3.The unresolved echo of the pasthaunts us every day.
过去未解之谜每天困扰着我们。