shí / yàn / rén / yuán / xiān / cè / liáng / sān / yuán / chún / de / chún / dù / zài / jìn / xíng / xià / yī / bù / shí / yàn

实验人员先测量三元醇的纯度，再进行下一步实验。

The lab workers first measured the purity of the triol before conducting the next experiment.