HSK 5
主动
zhǔdòng形
to take the initiative; to do sth of one's own accord; spontaneous; active
他主动留下来帮助大家。
Tā zhǔ dòng liú xia lái bāng zhù dà jiā.
He voluntarily stayed behind to help everyone.
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New in the HSK 3.0 word list at level 5.