The primary way you can control trace is by using the -Xtrace option on the command line or you can use the optional trace properties file if the option set is long or complex.

控制跟踪的主要方法是使用命令行选项 -Xtrace，或者在选项集比较长或复杂的情况下，使用可选的跟踪属性文件。

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With appropriate control, trace elements analysis could provide us with important information for studying past lifestyle and social systems.

加以合理的研究设计，微量元素的分析能为我们研究过去生活方式和社会制度提供重要的资料。

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Its control of each stage of production helps Smithfield to trace back any problems with pathogens and address them.

WSJ: What China Can Learn From America's Hot Dogs

Because kits are now distributed to fewer centres and every ball is coded (so that inspectors can trace strays), manufacturers have better control of production.

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"We have to find a way to not only have better control over who we receive e-mail from, but also to authenticate or trace the e-mail, " says an executive for a major brokerage firm, who asked not to be named.

CNN: Stopping the next Melissa