请问一下About two thousand students能否是about thousands of student

请问一下About two thousand students能否是about thousands of student 具体数字之前有“about”用thousand还是"thousands of"? tens of thousands等不等于about ten thousand About two thousand of the students in our school is learning two thousand of 和thousands of 区别 关于thousand、thousands、thousand of、thousands of thousand 、thousands、thousands of区别 thousand of 和 thousands of 哪一种是正确的?并且说一下什么情况下thousand （of）不能 是two thousand 还是 two thousands 哪个正确 是several thousand还是several thousands of ? This is a survey about dreams,in which thousands of students Is a number of this kind of rare birds about two thousand