请注意单词模型——为复数形式。

Notice the use of the word models - plural.

youdao

把平面问题的物理量和基本方程全部改写为复数形式，从平衡方程出发引入了复应力函数。

All of the physical quantities and basic equations of plane problem are expressed in terms of complex variable form. From the equilibrium equations, the complex stress functions are introduced.

youdao

不过，随着时间的推移，许多以英语为母语的人认为它是可数名词的复数形式，于是就有了逆成词pea。

Many English-speakers over time thought this was a plural count noun, though, and so pea is a back-formation.

youdao

So, Hesiod complains about them and calls them bribe swallowing basileis, crooked ones, plural; kings as in Homer.

因此,赫西奥德对他们进行控诉,称他们为"纳贿的巴赛勒斯们",复数形式的,就像荷马史诗中的"王者们"一样

耶鲁公开课 - 古希腊历史简介课程节选