科学家经常在老鼠身上做实验来研究人类疾病。

Scientists often ___experiment on mice to study human diseases.

在实验室里，科学家们通过实验来推进知识。

In laboratories, scientists ___experiment to advance knowledge.

研究人员必须小心地进行实验以确保有效的结果。

Researchers must ___experiment carefully to ensure valid results.