sì / yǎng / yuán / měi / tiān / qīng / lǐ / lóng / jiàn / bǎo / chí / dòng / wù / jū / zhù / huán / jìng / gān / jìng

饲养员每天清理笼槛，保持动物居住环境干净。

The keeper cleans the cage every day to keep the animals' living environment clean.