He has overstepped the mark, and it must stop.

他言行出格，必须制止。

《柯林斯英汉双解大词典》

If destructive words are being used, for whatever the reason, it must Stop.

如果你正在使用一些破坏性的词语，无论是为了什么都要立即停止。

youdao

Therefore if the world wants to reduce emissions, it must stop deforestation.

因此，如果世界希望减少碳排放，就必须停止砍伐森林。

youdao

And it must stop the attacks against slavery.

VOA: special.2009.03.26

So it goes at the village level - and so it must stop.

CNN: UP AND DOWN ON THE FARM

In Iran, the president said, the government knows it must stop trying to enrich uranium for purposes of building a nuclear weapon.

NPR: Bush Takes Different Tack on Iraq, Troop Levels

It must stop, and is why Acting Administrator Tangherlini has instituted several stringent new policies on spending to put an end to this misuse of taxpayer dollars.

CNN: GSA finds more than $250,000 spent on one-day event