1、Scientists quantitate the amount of enzymes in the sample to determine their activity levels.

科学家定量测定样品中酶的数量，以确定它们的活性水平。

2、The research team used a spectrophotometer to quantitate the concentration of the chemical compound in the solution.

研究团队使用分光光度计定量测定溶液中化合物的浓度。