HSK 7-9
长效
chángxiào名形
to be effective over an extended period
新制度需要建立长效机制。
Xīn zhì dù xū yào jiàn lì cháng xiào jī zhì.
The new system needs an effective long-term mechanism.
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Appears across levels (7-9) in the HSK 3.0 word list.