Wǒmen tíqián zhìdìng le yìngjí fāng'àn, yǒubèi-wúhuàn ma.
We drew up an emergency plan in advance, better safe than sorry.
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history
This idiom originates from the 左传 (Zuo Tradition), an ancient Chinese historical classic. The idea of preparation preventing calamity is a recurring theme in classical Chinese thought.