如题所述
thousand、million、billion、trillion、dozen、score的用法如下：
一、这几个数词前面有具体数字时，不加-s，后面可以直接加名词，分别表示“千”、“百万”、“十亿”、“万亿、兆”、“十二”和“二十”的意思。如：
five thousand birds
five million dollars
ten billion yuan
one trillion baht
one dozen eggs
I have learned English for one score years.
二、这几个字前无明确数字时，要用复数形式后加of，表示概数，如：
thousands of birds
millions of dollars
billions of yuan
trillions of baht
dozens of eggs
I have learned English for scores of years.
"thousand"和"thousands of"区别在于：
thousand前面加具体的数，如：two thousand
thousand of前面不加具体的数，后面接名词。如：thousands of years
thousand读音：['θaʊz(ə)nd]
n. 一千；一千个；许许多多;adj. 成千的；无数的
This train conveys over one thousand passengers every day.
这列火车每天运送一千多位旅客。
On marriage Women just have one idea about marriage, whereas men have one thousand and one.
女人对婚姻的看法只有一种；男人对婚姻的看法却有一千零一种.
She was the only black student out of a thousand there.
她是那所学校一千名学生中唯一的黑人学生。
thousands of读音：['θaʊz(ə)nds ɒv]
The war swept off hundreds and thousands of people.
那场战争夺去了成千上万人的生命。
They compiled thousands of case history to prove the relationship between smoking and cancer.
他们收集了数以千计的来证明吸烟与的关系。
Nor does it require the thousands of hours of study that we try to force upon school children.
它也不需要几千个小时的学习时间，像我们现在试图强迫学生去做的那样。
thousand、million、billion、trillion、dozen、score的用法如下：
一、这几个数词前面有具体数字时，不加-s，后面可以直接加名词，分别表示“千”、“百万”、“十亿”、“万亿、兆”、“十二”和“二十”的意思。如：
five thousand birds
five million dollars
ten billion yuan
one trillion baht
one dozen eggs
I have learned English for one score years.
二、这几个字前无明确数字时，要用复数形式后加of，表示概数，如：
thousands of birds
millions of dollars
billions of yuan
thousands of：成千上万的.---前面不加明确的数字.而且thousands of的s不可省略.后面加名词.
有数字在前面只能用thousand.
没有数字,后面加名词只能用thousands of.
thousand 是一个单词，属量词，意思是...千。比如说一千就是 a/one thousand;
thousands of 固定词组，表示成千上万的，同样的词组还有hundreds of(成百上千的)；millions of等等等等本回答被提问者和网友采纳
