youdao

You will understand the ways in which the software will get from any state to another state, and (very importantly) if you can define every operation, then you can track and undo it as well.

您将会理解软件从一个状态转到另一个状态的方式，而且（非常重要），如果您可以定义某个操作， 那么同样可以追踪并撤销它。

youdao

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。

youdao

After that more lines are on track to start operation every few months.

FORBES: On The Cover/Top Stories

Other initiatives, such as the large-scope Operation Bot Roast -- an active campaign to track down botnets, find operation control centers and the organizations behind them -- have been only partially successful, as several holes remain in the overall infrastructure.

CNN: Fighting the agents of organized cybercrime

The killing of Mr Terry was at the centre of a scandal over a failed US operation to track guns smuggled across the US-Mexican border.

BBC: Mexican arrested over US agent 'Fast and Furious' murder