“several thousand students ”中的“thousand"为什么不是复数?

“several thousand students ”中的“thousand为什么不是复数? several thousand与 several thousands of 的用法 several thousand 和 several thousands of 的区别及具体用法还有这一题：There are_____students in my school A.several thousand B.several thousands of several ______(thousand) dollars thousand要加s吗?several不是加可数名词的复数吗? 是several thousand还是several thousands of ?RT这两种我都见过。。 several 的用法several与hundred,thousand,million在一起怎样使用啊,hundred,thousand,million 是用单数还是复数?如果hundred,thousand,million后有名词呢? several thousands of 还是 several thousand这种题怎么做应该是several thousands of 啊因为他不表示具体的数字所以因该是several thousands of Several ____students came to the meeting答案和讲解A thousand B thousands C thousand of D thousands of many thousands of 与many thousand哪个对?字典上既有several thousands of 又有several thousand的表达方式,难道many就不行吗? ____foreigners come to visit this museum every year填several thousand of还是several thousand为什么 还有如果是five thousands 呢要不要加of Several ___students came to the library.A .thousand B .thousands of哪个对 several many 既可以修饰thousand 又可以修饰 thousands of There are ___ visitors in the Summer Palace every year.A.about 3 thousand B.many thousands C.several thousand D.lots thousand several thousand还是several thousands ofI know a man who has a coin collection worth several ____ dollar.A.thousandB.thousands of several many 既可以修饰thousand 又可以修饰 thousands of there are several( )of students in that big school.(千）填thousands ,还是thousand谢谢 thousands of English words/several thousand English words这2种说法对吗? get away The robbers got away with several thousand pounds这句话是什么意思呢 thousand前加several或者many时其后要加s吗?