定语从句可以同时修饰前面用and连接的两个主语。例如：

1. The book and the pen that I bought yesterday are very interesting.

2. The house and the garden that we live in are very beautiful.

在这些例子中，定语从句“that I bought yesterday”和“that we live in”分别修饰了前面用and连接的两个主语“the book and the pen”和“the house and the garden”。