shí / yàn / shì / lǐ / yǎng / zhe / jǐ / zhī / xiǎo / bái / shǔ / yòng / lái / guān / chá / yào / wù / de / xiào / guǒ

实验室里养着几只小白鼠，用来观察药物的效果。

Several lab mice are being kept in the laboratory to observe the effects of the drug.