If a problem occurs during run time, turn on the appropriate trace switch.

如果在运行时出现问题，请打开相应的跟踪开关。

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In that case, you would use one trace switch for the data access module and one switch for the rest of the application.

这种情况下，可以将一个跟踪开关用于数据访问模块，而将另一个开关用于应用程序的其余部分。

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Trace and debug Settings specify trace listeners that collect, store, and route messages, and the level where a trace switch is set.

跟踪和调试设置指定对消息进行收集、存储和路由的跟踪侦听器，并且还指定设置跟踪开关的级别。

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Scientists have used chromophores for decades to detect chemicals, but, until Fido, they weren't sensitive enough to detect trace explosives because each molecule of TNT vapor would switch off just a single chromophore, with the result that faint wisps of evil chemicals caused no visible change in luminosity.

FORBES

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

ECONOMIST: The daily take