shí / yàn / zhōng / wǒ / men / yòng / shí / ruǐ / shì / zhǐ / jiǎn / cè / róng / yè / de / suān / jiǎn / xìng

实验中，我们用石蕊试纸检测溶液的酸碱性。

In the experiment, we used litmus paper to test the acidity or alkalinity of the solution.