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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You can change the level of a trace switch by putting it in a configuration file.

您可以将追踪参数放在组态档中，以变更参数的层级。

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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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In this second inaugural address, Obama the Candidate became Obama the President without a trace of the bait and switch to which too many citizens have become so accustomed that in their cynicism they cease to vote at all.

CNN: Obama finally meets Machiavelli

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