一道关于thousands of 和thousand of 区别的用法 求助

一道关于thousands of 和thousand of 区别的用法 求助 thousand和thousands of的用法有什么区别? thousand,thousands,thousand of,thousands of的区别 区分 Thousands of 和 数词+thousand of 的用法 关于thousand、thousands、thousand of、thousands of thousand 、thousands、thousands of区别 two thousand of 和thousands of 区别 thousand of 与 thousands of的区别 several thousand 和 several thousands of 的区别及具体用法 关于many thousand 和many thousands of thousands of 与thousand 的区别? thousand 与 thousands of 区别