most of which怎么用啊啊啊...怎么套到从句里..

在（定语）从句中,most of whom修饰主句的主语或表语（名词/代词+of+which/whom）
修饰限定表语
There are 300 desks in the hall, most of which are new.
大厅里有300把桌子,大多数（桌子）都（是）新的.
相当于：
There are 300 desks in the hall and most of them are new.
修饰限定主语
Millions species die yearly, most of which are unknown to us.
明年数以百万计物种消失,而其中绝大部分对我们来说都是未知的.
相当于：
Millions species most of which are unknown to us die yearly.
或Millions species die yearly and most of these species are unknown to us.
 
供参most of which都可以替换成 the majority of which麽??仍以上例说明。例1，可替换（语法上可）There are 300 desks in the hall, most of which are new.相当于There are 300 desks in the hall, the majority of which are new.例2，则不都能替换Millions species die yearly, most of which are unknown to us.相当于Millions species die yearly, the majority of which are unknown to us. 但Millions species most of which are unknown to us die yearly.转化如下——Millions species the majority of which are unknown to us die yearly.（×）Millions species of which the majority are unknown to us die yearly.（√）