The researchers gave participants a genetic saliva test to determine which type of coffee metabolizer they were.

研究人员给参与者做了基因唾液测试，以确定他们是哪种类型的咖啡代谢者。

We took a saliva test for COVID-19 and then two more stops, one of which was finally immigration.

我们接受了新冠肺炎唾液检测，之后还要经过两个站点，其中一站终于是入境检查点了。

Alternatively, blood or saliva tests late at night can help check if there's a normal daily rise and fall of cortisol levels.

另一种方式是，在晚上做血检或唾液检，来检查日常的皮质醇水平升降是否正常。