1. Nothing can extenuate his crime.
    他的罪责无法减轻。；他的罪责无法用任何辩解减轻。

2. Nothing can extenuate his guilt.
    他的罪无法减轻。

1. 减轻：extend 延长 | extenuate 减轻 | exterior 外在的; 外面,外表

2. 使(罪过等)显得轻微：exhume#从墓中掘出 | extenuate#使(罪过等)显得轻微 | extol#颂扬

3. 掩饰(罪行),减轻罪过：extant 现存的,传世的 | extemporize 即席演说 | extenuate 掩饰(罪行),减轻罪过

4. 低估：extenttable 范围表 | extenuate 低估 | extenuation 低估

1. lessen or to try to lessen the seriousness or extent of

    e.g. The circumstances extenuate the crime

    Synonym: palliatemitigate