For comparison, the researchers also measured mercury concentrations in other aquatic organisms.

研究人员为了进行比较，还测量了其他水生生物中的汞浓度。

The scientists measured concentrations of the stress hormones in the students' saliva before and after the talk.

科学家们在演讲前后测量了学生唾液中压力荷尔蒙的浓度。

The team measured mercury concentrations in thousands of dragonfly larvae collected from waterways in 100 national parks during a 10-year period.

该团队在10年的时间里，从100个国家公园的水道中收集了数千只蜻蜓幼虫，对它们体内的汞浓度进行了测量。