It can be used to track which operation finished if the same completion-handler object is used for multiple operations.

如果相同的对象用于多个操作，其可用于追踪哪个操作已完成。

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Note that in many cases all of the powder used is present in the finished product, scrap losses will only occur when secondary machining operations are necessary.

可以看到在很多情况下所有使用的粉末都包含在制成品中，废料损失仅产生于需要辅助机加工时。

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Whereas posterior capsular was damaged and vitreous body was loss in 3 eyes (3.3%) and the operations were finished in retrobulbar anesthesia.

后囊膜破损玻璃体丢失率3.3%(3只眼)，术中追加球后麻醉，方完成手术。

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In the Euronews interview, Col Gaddafi's son said military operations against the rebels were "finished" and everything would be over within 48 hours.

BBC: Gaddafi: 'Libya funded Sarkozy's French poll campaign'

But the project has met with technological problems, and the reactor hasn't yet finished necessary safety checks by the government to restart operations.

WSJ: Panel: Active Fault Runs Beneath Japan Reactor

When Britain's GKN finished spinning off its fast-growth, high-profit industrial services operations in August, a lot of investors looked at what was left and concluded that the 240-year-old engineering company had sold off the best part of its franchise.

FORBES: Beefing up the rump