thousand和thousands of的用法有什么区别?

thousand和thousands of的用法有什么区别? thousand thousands thousand of thousands of 什么区别 一道关于thousands of 和thousand of 区别的用法 求助 区分 Thousands of 和 数词+thousand of 的用法 thousand,thousands,thousand of,thousands of的区别 several thousand 和 several thousands of 的区别及具体用法 thousand 、thousands、thousands of区别 two thousand of 和thousands of 区别 nine thousand和nine thousands有什么区别?哪一个后面可以加of? thousand of 与 thousands of的区别 thousands of 与thousand 的区别? 有没有many thousand,several thousand,和several thousands of