The first 24 hours after the operation are the most critical.

病人手术后头24小时是最危险的。

《牛津词典》

Note also the emphasis on measurement; feedback loops are critical in any operation that requires improvement, and/or is subject to a changing environment.

还要注意的是对度量的强调，反馈循环是任何需要改进的运作中的关键，并且/或者要经受变更的环境。

youdao

These are qualities of computing necessary for continuous operation of critical it in large enterprises.

这些是大型企业中的关键IT的持续操作所必需的特质。

youdao

When I reflect on the first couple of years of Baidu's operation, I think there are three things that's very critical.

当我回想百度最初的那几年，有三件事是非常重要的。

斯坦福公开课 - 百度CEO李彦宏演讲：全球最大搜索引擎的发展课程节选

The data collected during a critical operation to monitor hydrocarbon inflow was ignored and nothing was done.

WSJ: The Oil Disaster Is About Human, Not System, Failure

The first minutes of the assault operation are considered critical.

NPR: U.S.-Afghan Force Raids Suspected Taliban Hideout

In a recent survey conducted by Corenet, corporate real estate managers in the northeast corridor reported that Hurricane Sandy had affected a variety of functions, including the operation of mission-critical facilities, data storage, back up energy sources and access to transportation infrastructure.

FORBES: Low-Income Housing Hit Hardest By Superstorm Sandy