Tracking the spread of a disease is an important step in stopping its outbreak.

追踪疾病的传播是阻止其爆发的重要一步。

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This skips out the intermediary step of obtaining a ServiceReference, but does require that you call open after construction, in order to begin tracking services.

这就跳过了中间获得ServiceReference的几步，但是要求你在构造之后调用open，以便开始跟踪服务。

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Real time location tracking means that parts, assemblies, and products can be tracked through each step in the process.

实时位置跟踪意味着部件、集合和产品可以在流程的每一步中进行跟踪。

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"The critical next step is for the NYPD to start tracking crimes in all parks over an acre, as mandated by city legislation, so that the parks department can allocate these new security officers where they're most needed, " she said.

WSJ: City Park Patrols Will Be Bolstered