The subjects also provided urine so the researchers could measure the amount of nicotine and its metabolites, like cotinine, for an objective record of their exposure to cigarette smoke.

这一项目中还包括尿检，因此研究人员还可以测量尿中尼古丁及其代谢物的含量（如可铁宁），这样会得到有关他们处于烟雾中时的情况的比较客观的记录。

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The subjects also provided urine so the researchers could measure the amount of nicotine and its metabolites, like cotinine, for an objective record of their exposure to cigarette smoke.

这一项目中还包括尿检，因此研究人员还可以测量尿中尼古丁及其代谢物的含量（如可铁宁），这样会得到有关他们处于烟雾中时的情况的比较客观的记录。

youdao