HSK 7-9
兢兢业业
jīngjīngyèyè形
(idiom) conscientious; assiduous
会计兢兢业业核对每笔账目。
Kuài jì jīng jīng yè yè hé duì měi bǐ zhàng mù.
The accountant conscientiously checks every transaction.
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Appears across levels (7-9) in the HSK 3.0 word list.