shíyàn / rényuán / xiān / lǜqīng / róngyè / zhōng / de / zázhì / zài / jìnxíng / xiàyíbù / jiǎncè

实验人员先滤清溶液中的杂质，再进行下一步检测。

The laboratory staff first filter out the impurities in the solution before carrying out the next test.