Nothing would prevent him from speaking out against injustice.

什么都不能阻止他鸣不平。

《牛津词典》

Let us arm against injustice.

让我们防止不公正的行为。

youdao

They have warred against injustice for many years.

他们为了公平斗争了多年。

youdao

She spoke against racial injustice.

VOA: special.2010.01.17

And Hobbes reasons from this story that while David's action may have sinned against God, he did no injustice to Uriah, imagine that.

霍布斯从这个故事中得出结论说,尽管大卫的所作所为触犯了上帝的旨意，但对乌利亚他却是合理的，你能想象这事吗。

耶鲁公开课 - 政治哲学导论课程节选

We know how to come together and fight against injustice when the alleged perpetrators are white.

CNN: Violence and race: a two-way street

He was a man who lived his conscience by speaking out against injustice.

CNN: Pope Francis' powerful signal to the poor

The real moral crusade would be to take a principled stand against injustice.

BBC: News | UK Politics | Charles Kennedy's speech in full