表示“部分与整体”的关系用of which/whom

在非限制性定语从句中，表示“部分与整体”的关系时，用…of which/whom或者of which/whom…都可以。表示部分的可以是具体数目或百分数，也可以是few, several, some, half, many, much, most, all, none, either, neither, a quarter, a number, the larger, the smallest, the majority [məˈdʒɒrəti]等。

Our school has 80 teachers, 50 of whom are women. = Our school has 80 teachers, of whom 50 are women.

我校有80个教师，其中50个是女的。

He was also a writer of beautiful stories, some of which are collaborations with his fiancee.

他还写了一些美妙的故事，其中有些是和他的未婚妻合著的。

I saw three camp beds, two of which were occupied.

我看见了3张折叠床，其中两张已有人占了。

In each packet there are batches of letters, most of which are undated.

每个包裹里都有一摞摞的信件，其中大部分都没有日期。

The football supporters began throwing missiles, one of which hit the referee.

足球迷们开始扔东西，其中还砸到了裁判一次。

He has lots of books, most of which are English ones. 他有许多书，其中大部分是英语书。

注意：这里的of which不能用whose代替，这与表示所属关系的of which不同：

The room the door of which is blue belongs to me. = The room whose door is blue belongs to me.

门是蓝色的那间房是我的。