Tens of thousands of students wewe present at the meeting on May 4th.两个数次后面为什么都要加s?

tens of thousands tens Tens of thousands of tens and thousands of tens of thousands tens of thousands thousands of tens of thousands of a couple tens of thousands tens of millions tens of millions of 等于 thousands of 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和tens of millions 的意思 Tens of thousands 什么表达方法? tens of thousands of people 和tens of thousands more people的微小差别?如何翻译? thousands of;tens of thousands of;hundreds of thousands of这三个词组中文意思? thousands and tens of和tens and thousands of哪个对 英语翻译tens of thousands of people怎么翻译啊 Tens of thousands of school children是什么意思?thousands of 是成千上万的意思,那前面的Tens of呢? Tens of thousands of school children是什么意思?thousands of 是成千上万的意思,那前面的Tens of呢?