He died of a heart attack during a routine operation.

他在一次普通手术中死于心脏病。

《牛津词典》

Group B: Routine operation in 48 cases as control.

组48例采用常规手术方式作对照。

youdao

He died during a routine operation which went wrong.

他因一次例行性手术出错而死亡。

youdao

There are conflicting accounts of what happened. The Israeli army says its troops came under sniper fire during a routine operation on Israel's side of the frontier.

VOA: standard.2010.08.03

The expectation is that it would have an ultra-low operating cost, achieved through routine operation.

BBC: Skylon: Ending 40 years of hurt

Four Hamas members were killed when soldiers entered northern Gaza in a routine operation against militants, an Israeli military spokeswoman said.

CNN: Israeli-Palestinian fighting kills 21

One officer spoke good English and I explained that we were conducting a routine operation, as allowed under a United Nations mandate.

BBC: NEWS | UK | Royal Navy captives: Key quotes