The police have launched a major operation against drug suppliers.

警方发动了一次打击毒贩的大规模行动。

《牛津词典》

Weight-loss surgery is a major operation.

这是大手术。

youdao

This is a major operation under general anaesthetic and involves being in hospital for about a week to ten days.

这是一种需要全身麻醉的大手术，并且需要住院大约一星期到十天。

youdao

That includes Bill Clinton. He had a major operation because of blockages in two thousand four.

VOA: special.2010.02.17

While the military has not publicly set a date for any major operation in the area, U.N.officials say some 80,000 civilians have fled the region in anticipation of a new offensive.

VOA: standard.2009.10.03

President Obama, at his first major press conference, called on a reporter for a Web-only operation, the Huffington Post.

VOA: special.2009.03.21

Though well liked, particularly among his 30-something peers, Silverman has little to no experience developing content--or managing a major operation.

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It's a major operation, and she didn't want to take any chances.

FORBES: Magazine Article

But a British expert said that while giving only a local anaesthetic for such a major operation had advantages, it also involved extra risks for the patient.

BBC: Heart bypass - with local anaesthetic