dozen 的用法什么时候用dozens of dozen of

dozen
[`dEJzEn]
n.一打, 十二个
dozen
duo2+zen10
[5dQz(E)n]
adj, n
dozen 或 dozens
一打，12个
I want a dozen of pencils, please!
劳驾，我要一打铅笔。（缩写为： doz)
dozens of
许多
There were dozens of people there.
那里有许多人。
dozen
AHD:[d緕搮n]
D.J.:[6d(z*n]
K.K.:[6d(z*n]
n.abbr:doz.abbr:dz.
pl. dozen;
A set of 12.
dozens
An indefinite, large number:
dozens of errands to run.
dozen
adj.
Twelve.
Middle English dozeine
fromOld French dozaine
from doze[ twelve ]
ultimately fromLatin duodecim
duo[ two ]
*See Also : dwo- In Appendix
decem[ ten ]
*See Also : dek? In Appendix
dozenth
AHD:[-昂th] adj.
dozen
AHD:[d緕搮n]
D.J.:[6d(z*n]
K.K.:[6d(z*n]
n.abbr:doz.abbr:dz.
pl. dozen;
【复数】 dozen;
A set of 12.
打十二的集合
dozens
An indefinite, large number:
不确定的大数量的：
dozens of errands to run.
许多要跑腿的差事
dozen
adj.
Twelve.
十二
Middle English dozeine
中古英语 dozeine
fromOld French dozaine
源自古法语 dozaine
from doze[ twelve ]
源自 doze[ 十二 ]
ultimately fromLatin duodecim
最终源自拉丁语 duodecim
duo[ two ]
duo[ 二 ]
*See Also : dwo- In Appendix
decem[ ten ]
decem[ 十 ]
*See Also : dek? In Appendix
dozenth
AHD:[-昂th] adj.

dozen 一打 12
dozens of 几十个 很多
dozen 前有具体数字时 或有a many several 修饰时 dozen 不加s.
如 three dozen egges.
所修饰的名词 有these 或是代词时 dozen 后加of
如 three dozen of these egges
three dozen of them