HSK 7-9
介入
jièrù动
to intervene; to get involved
警方及时介入双方争执。
Jǐng fāng jí shí jiè rù shuāng fāng zhēng zhí.
The police intervened promptly in the dispute.
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Appears across levels (7-9) in the HSK 3.0 word list.