shí / yàn / rén / yuán / bǎ / liú / suān / nà / jiā / rù / shuǐ / zhōng / guān / chá / tā / de / róng / jiě / qíng / kuàng

实验人员把硫酸钠加入水中，观察它的溶解情况。

The lab workers added sodium sulfate to the water and observed how it dissolved.