If you don't upgrade this skill, it wouldn't be able to inflict much damage.
Examples (Wiktionary)
Mandarin
打得好,可能全部或大部或一部消灭他;打不好,也给他一个大的杀伤。
打得好,可能全部或大部或一部消滅他;打不好,也給他一個大的殺傷。
dǎ de hǎo , kě néng quán bù huò dà bù huò yī bù xiāo miè tā ; dǎ bu hǎo , yě gěi tā yī ge dà de shā shāng .
If we fight well, we may destroy the entire enemy force or the greater part or some part of it, and even if we do not fight so well, we may still inflict heavy casualties.