shí yàn zhōng / yán jiū yuán / dī rù / jǐ dī / zhǐ shì jì / guān chá / róng yè / yán sè / de / biàn huà

实验中，研究员滴入几滴指示剂，观察溶液颜色的变化。

During the experiment, the researcher added a few drops of indicator and observed the change in the solution's color.