shí yàn rén yuán / cè liáng / le / zhè / píng / qīng jié jì / de / suān dù / yǐ / què bǎo / shǐ yòng / ān quán

实验人员测量了这瓶清洁剂的酸度，以确保使用安全。

The laboratory staff measured the acidity of this bottle of cleaning agent to ensure that it was safe to use.