dú / lǐ / xué / shì / yán / jiū / huà / xué / wù / zhì / duì / shēng / wù / tǐ / wēi / hài / de / xué / kē毒理学是研究化学物质对生物体危害的学科。Toxicology is the study of the harmful effects of chemical substances on living organisms.