根治 (gēn zhì): to bring under permanent control; to effect a radical cure

The doctor told Lao Zhang that his stomach condition requires taking medicine on time and watching his diet; only after sticking with it for several months can it be cured completely.

This river used to be black and smelly; after three years of cleanup, the pollution problem was finally brought under permanent control.

The company decided to start with its management system to permanently fix the problem of departments shifting blame onto one another.

To permanently solve urban traffic congestion, we can't just build more roads; we also need to develop public transportation and reduce private car trips.

Once this kind of bad habit takes hold, it is very hard to eradicate completely, so parents need to guide their children carefully when they are young.