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。

youdao

Only one MPM can be active at one time, and it must be compiled in statically with --with-mpm=(worker|prefork|event).

每次只能有一个 MPM 是活动的，必须使用 --with-mpm=(worker|prefork|event) 静态编译。

youdao

The event model in active real-time system includes the category, description and manipulation of it.

主动实时系统的事件模型包括了事件的分类、描述和对其的操作。

youdao

Also of note: At the time, it seemed that he might return from the Olympics to active management, but in any event, he did not.

CNN: Facts don't support Obama's charges against Romney