在（定語）從句中,most of whom修飾主句的主語或表語（名詞/代詞+of+which/whom）
修飾限定表語
There are 300 desks in the hall, most of which are new.
大廳里有300把桌子,大多數(shù)（桌子）都（是）新的.
相當(dāng)于：
There are 300 desks in the hall and most of them are new.
修飾限定主語
Millions species die yearly, most of which are unknown to us.
明年數(shù)以百萬計物種消失,而其中絕大部分對我們來說都是未知的.
相當(dāng)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.
 
供參most of which都可以替換成 the majority of which麼??仍以上例說明。例1，可替換（語法上可）There are 300 desks in the hall, most of which are new.相當(dāng)于There are 300 desks in the hall, the majority of which are new.例2，則不都能替換Millions species die yearly, most of which are unknown to us.相當(dāng)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.轉(zhuǎn)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.（√）