unknown;nameless;obscure;

They are very hard-working, and they are unsung because nobody knows what they are doing.
他们工作很努力, 只因为无人知晓而没没无闻.
来源:词典精选例句She met across him and know that he had been living an inglorious life.
她偶遇他,知道他仍过着没没无闻的生活.
来源:词典精选例句
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