The donkey is a domesticated form of the African wild ass.
驴是非洲野驴的
种已驯化的品种。
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But in modern times, numbers of grazing animals have declined sharply because of extinction, when a species of animal – the dinosaurs for example – no longer exist, and domestication, when wild animals are controlled by humans to work or for food.
但在现代,由于灭绝(例如恐龙等物种已不复存在)和驯化(野生动物被人类控制以用于劳作或食用),食草动物的数量急剧减少。
科普