可填 similarity。又如：

There’s a striking similarity between the two girls. 这两个女孩惊人地相像。

I can see the similarity between you and your mother. 我能看出你和你母亲的相似之处。

A lot of people have remarked on the similarity between them. 很多人都说过他们有相似之处。

The report highlights the similarity between the two groups. 这份报告强调两组之间的相似性。