What's the idiom for storing things you don't need and taking them out when you need them?

拼音： yǒu bèi wú huàn

Explanation: 患：祸患，灾难。 If you are prepared beforehand, you can avoid disasters.

Origin: Shangshu (尚书-说命中)："But in everything, there is preparation, and there is no danger in preparation." Zuo Zhuan (左传-襄公十一年)："Considering danger in peace and security, thinking is being prepared, and there is no danger in being prepared."

Example sentence: Ji Si forewarned the people of Wenshang to repair the dike and build houses. In less than three days, it really rained heavily, and the water in Wen flooded, so the people of Lu were prepared. ★Ming Feng Menglong, "East Zhou Lian Guo Zhi", 78th time? Used to admonish people

English: brace youself for a shock