in tens of是什么意思?

in tens of是什么意思? in the tens of millions Tens of thousands of school children是什么意思? tens of thousands of student是什么意思? 请问tens of thousands of tourists是什么意思? tens of thousands tens what's the meaning of "in tens of dollars" 请问"tens of millions"是什么意思?具体用法是怎样的? Tens of thousands of "tens of millions tens of kilograms 意思 tens of thousands