在婚礼上，他介绍了所有的姻亲给新娘认识。

At the wedding, he introduced all the ___affinal relatives to the bride.

在几何学中，仿射变换可以保持平行线之间的关系不变。

In geometry, ___affine transformations keep the relationship between parallel lines unchanged.

这两种语言在语法结构上有着密切的相似性。

The two languages are ___related in their grammatical structures.