A thousand-mile embankment was destroyed in an ant nest

The phonetic notation qiān lǐ zhī dī, hui yú yǐ xué

Definition: destroyed. Anthill: The burrow of ants. It refers to a very long dike, which will eventually be destroyed due to the gnawing of small ants. It is a metaphor that if you don't pay attention to small things, you will cause a big disaster; if you don't pay attention to small things, you will cause serious losses.