To forestall is better than to amend.; Prevention is better than cure.

与其补救于已然，不如防范于未然。

Prevention is better than cure.

预防胜于治疗(治病不如防病)。

Sure. Prevention is better than cure.

好的。预防总比治疗强。

I am greatly convinced that prevention is better than cure.

我深信预防胜于治疗。我深信预防胜于治疗。我深信预防胜于治疗。

As is routinely pointed out, prevention is better than cure-and cheaper too.

经常有人指出，预防好过治病——还更便宜。