古老的律法常常遵循以眼还眼的原则，要求伤害必须得到同等报复。

Ancient laws often followed the ___eye-for-an-eye principle, demanding equal retribution for harm.

他坚持要以牙还牙的方式报复那个欺负他弟弟的人。

He insisted on taking an ___eye-for-an-eye approach to retaliate against the person who bullied his younger brother.