井底之蛙
HSK 7-9frog at the bottom of a well: narrow-minded; limited vision
Examples
别做井底之蛙,多看看外面的世界
Don't be narrow-minded, look at the outside world
只懂一点就自满,
Knowing just a little and being satisfied
真是井底之蛙
It's truly like a frog at the bottom of a well