In practice, as you have seen, the result tree is not materialized in memory, so the serializer is handed the nodes of the tree one at a time in document order.

实际上，如您所见，结果树没有在内存中具体化，所以串行化器将按文档顺序一次交出树的一个节点。

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Many recent studies have shown that in order to be truly effective, one has to focus on one task at a time.

许多近些年来的研究都表明，如果真的想使问题解决的更有效，那么，在一段时间内必须抓住一个重点。

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If more events occur before the event handler returns, browsers enqueue them until the event handler does return, and then process the queued events in order, one at a time, synchronously.

如果在事件处理器返回之前发生了更多的事件，浏览器就将它们放在队列中；当事件处理器返回时，依次同步地处理排队的事件，每次一个。

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The company said a one-time order at the factory was completed weeks ago and that none of the companies there is a supplier now.

WSJ: Before Bangladesh Collapse, Some Clothing Retailers Fled Risk

Benetton said a one-time order from the collapsed factory was completed weeks ago, and that none of the companies there is a supplier now.

WSJ: American Taste for Cheap Clothes Fed Bangladesh Boom

But on Monday, after labor groups found Benetton-labeled clothing and production documents in the rubble, the company acknowledged a "one-time, subcontracting order that was completed several weeks ago, " a Benetton spokeswoman said.

WSJ: Doomed Factories Raced to Fill Orders