HSK 7-9
趁机
chènjī副
to seize an opportunity
大家休息时我趁机整理资料。
Dà jiā xiū xi shí wǒ chèn jī zhěng lǐ zī liào.
I seized the opportunity to organize the materials while everyone rested.
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Appears across levels (7-9) in the HSK 3.0 word list.