若无医疗干预，这孩子早就没命了。

Without medical ___intervention, the child would have died.

我写信是就一件严重影响贵公司商业信誉的事情，恳请您介入处理。

I write to seek your ___intervention in a matter that has impacted our business reputation.

经济学家们就政府干预自由市场的必要性展开了辩论。

The economists debated the necessity of government ___intervention in the free market.