You must add at least one general trace provider or enable the system trace provider.

您必须添加至少一个一般跟踪提供程序或启用系统跟踪提供程序。

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Time concept is proposed in MSC2000, this paper introduces the time event and time-constrained merge, which can help the analysis of system trace.

结合MSC2000中新增的时间概念，提出了时间事件与时限归并，用于分析包含时间概念的MSC系统进程轨迹。

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Through this system, trace gases, aerosol, volatile organic components, greenhouse gases, solar radiation, dry and wet deposition and meteorological elements can be observed continuously.

这些观测系统对微量气体、气溶胶、挥发性有机物、温室气体、太阳辐射、干湿沉降、气象要素等进行连续观测。

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Officials at the International Colored Gemstone Association, for instance, are pushing to create a system to trace the origins of colored gems.

WSJ: Secret Rocks and Gem Hunters | WSJ.Money Summer 2013

His recommendation that Britain switch to an alternative-vote system sank without trace.

ECONOMIST: The daily take

In Northern Ireland there is a system that allows you to trace back to the farm and even when the produce was harvested, Elliott says.

BBC: Horsemeat scandal: How often does food fraud happen?