_Many thousands of_books must bu produced for the children.为什么不是Many thousand of?

_Many thousands of_books must bu produced for the children.为什么不是Many thousand of? thousands thousands and thousands thousands of thousands是什么意思 _many different kinds of fruitsa.we have b,there is thousands of thousands of thousands是什么意思? four thousands thousands of. thousand 、thousands、thousands of区别 thousands and thousands of 和thousands of的区别 thousands and thousands of与thousands of的区别? thousands of tens of thousands of tens and thousands of thousands of people Hundreds of thousands tens of thousands tens