不为人知
(不為人知)unknown
Example Sentences
这位老科学家隐姓埋名多年，做出了许多不为人知的重要贡献。
zhè wèi lǎo kē xué jiā yǐn xìng mái míng duō nián, zuò chū le xǔ duō bù wéi rén zhī de zhòng yào gòng xiàn.
This old scientist has remained anonymous for many years and made many important contributions that are unknown.
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