animals是复数，例如：

1.She is an expert in training animals.她是驯兽专家。

2.But in the end, I learnt how to use the fat of dead animals to make a light.但最终我学会了如何使用死兽的脂肪来点灯。

3.Many people do not like the idea of experiments on animals.许多人不赞成在动物身上做试验