HSK 7-9
默默无闻
mòmò-wúwén(idiom) unknown; unrenowned
他默默无闻地守护森林多年。
Tā mòmòwúwén de shǒuhù sēnlín duōnián.
He guarded the forest quietly for many years without recognition.
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Appears across levels (7-9) in the HSK 3.0 word list.