根深蒂固

The part of a plant that grows underground; the base or foundation of something; the origin or source of a matter; a classifier for long, thin objects.

Deep; depth; far; very; profound; intense; late; thick; dense; flourishing.

The stem or stalk connecting a fruit to its branch; the base of a flower; by extension, the end or extremity.

Solid; firm; strong; secure; stable; to strengthen; to consolidate; to fix firmly; to ensure; to be sure; indeed; to be sure; to be certain; to be undoubtedly.