如果要用英语表达“她们很普通”，可以说："They are very ordinary."

"Ordinary"是一个形容词，意思是“普通的，平凡的”。这个词源自拉丁语"ordinarius"，意思是“按规则的，例常的”。

例句：

I pke spending time with my family on ordinary days. 我喜欢在普通的日子里和家人在一起。
She was an ordinary person who did extraordinary things. 她是一个普通人，做了不寻常的事情。
He was just an ordinary man who loved his family. 他只是一个普通的男人，热爱他的家人。