Only one task may hold the mutex at a time, and only this task can unlock the mutex.

一次只能有一个任务持有互斥锁，并且只有这个任务可以解锁互斥锁。

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There's only one event that can bring this many campers together at one time.

VOA: standard.2010.07.31

It's this extraordinary insight that he gives us: we can only read one word at a time, we can only read one line at a time.

这是他告诉我们的非凡的洞察：,我们一次只能读一个词，或是一行。

耶鲁公开课 - 弥尔顿课程节选

So, this pathway might not be the only one that's being activated inside the cell at any given time.

因此,任一时刻细胞内,激活的信号通路不只是一条

耶鲁公开课 - 生物医学工程探索课程节选

One can say that in this respect, its time horizon is only one year.

FORBES: O'Shaughnessy's Approach Yields Five Big Caps

DVD-R: This is a one time only recordable format, similar to burning CDs with a CD-R.

FORBES: Standards tangle

Only this time, going one better than its Super Bowl ads in 2011 and 2012, Chrysler did it twice.

FORBES: Chrysler Scores Big -- Twice -- With Surprise Super Bowl Ads