Two wrongs don't make a right.
两个错加不出一个正确来.
Two wrongs do not make a right.
二错相加仍是错.
Ignoring her after insulting her won' t help-two wrongs don't make a right.
辱骂她后又不理她没有用——她错了不等于你就正确.
Although it was obvious that his friend had cheated him,he shouldn't have hit him.Two wrongs don't make a right.
虽然他的朋友欺骗了他,但他不应该打他.他错他也错,两人都不对.