The effect of this is that if an event handler implements a request-response operation, then only one instance of such an event handler may be active at any point in time.

此规定的结果是，如果某个事件处理程序实现了一个请求-响应操作，则在任何时间点，只能有一个此类事件处理程序的实例处于活动状态。

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Only one defragment operation is allowed on a partition at a time.

在一个分区上，仅允许同时进行一个碎片整理操作。

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You can set up a task in the task center such that the refresh operation of the MQT will happen at a time of your choice.

您可以在任务中心设置任务，使MQT中诸如刷新之类的操作在您选择的时间发生。

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The Bureau had a search warrant at the time, but no approval to carry out a bugging operation.

BBC: FBI keeps its bugging secrets

The spat has poisoned relations between America and Europe at a time when their close co-operation is more important than ever.

ECONOMIST: The risks to free trade

By mentoring staff, a non-profit board member gets the chance to see the inner workings of the outfit, add value to the operation, and at the same time establish good will among a team.

FORBES: Building Successful Non-Profit Boards