HSK 7-9
居安思危
jū’ān-sīwēito think of danger in times of safety; to be vigilant in peacetime (idiom)
企业发展顺利时也要居安思危。
Qǐ yè fā zhǎn shùn lì shí yě yào jū ān sī wēi.
Even when business is going well, a company should remain alert to danger.
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Appears across levels (7-9) in the HSK 3.0 word list.