Which idiom is used to describe that things take a long time to deal with?

The weather is fine, prepare for the bad weather.

Y Pei Qiao mu

[Interpretation] Take precautions: repair houses. Before it rains; It is necessary to repair doors and windows. Metaphor is to prepare in advance; Take preventive measures.

[Language] Zhu Ming Bailu's Family Training: "It is advisable to plan ahead; Digging a well is not thirsty. "

[pronunciation] Miao; It can't be pronounced "Mio".

[Body discrimination] Miao; Can't write "fallacies".

Take precautions before they happen.

Anxious to dig a well