dòng / wù / yuán / lǐ / yě / huì / sì / yǎng / shí / fǔ / dòng / wù / bāng / zhù / yóu / kè / liǎo / jiě / shēng / tài / xì / tǒng

动物园里也会饲养食腐动物，帮助游客了解生态系统。

Zoos also keep scavengers to help visitors learn about ecosystems.