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POSIX provides the mutex function to create critical sections that enforce exclusive access to an object (a piece of memory) by a single thread.

POSIX 提供了互斥函数来创建临界区，用于实施单线程对对象（一块内存）的独占访问。

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Backup is a critical change control function.

备份是一项关键的更改控制功能。

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Overlooking this critical function is short-sighted.

FORBES: The Middle Management Crunch

I'm also going to just be talking about some more mundane matters, things like making sure that we have our government personnel in place on critical positions -- in critical positions that involve our basic government function and seeing if we can accelerate that and try to find some agreement in those areas.

WHITEHOUSE: President Obama Meets with House and Senate Leaders

Omega-3 is a long-chain fatty acid critical for brain structure and function.

CNN: Opinion: Unlocking crime using biological keys