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。

youdao

All this was compatible with older devices so long as there was only one authoritative timekeeper; but with urban growth and the multiplication of time signals, discrepancy brought discord and strife.

所有这些都与旧的设备兼容，只要只有一个权威的计时器；但随着城市的发展和时间信号的倍增，报时的差异导致了不和与冲突。

youdao

You can use this script only on one file at a time.

您一次只能在一个文件中使用这个脚本。

youdao

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

The man had never used weapons, had fired this unlicensed revolver only one time, to try it out when he bought it from a bootlegger.

NEWYORKER: Nawabdin Electrician

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