是thousands and thousands of还是thousands of要权威的。
必须这两个里。成千上万用英语表达：Tens of thousands of.重点词汇：thousands 一、读音：英 ['θaʊzndz] 美 ['θaʊzndz]二、意思是：n. 数千 三、例句：1、The desert stretches for thousands of miles。.
成千上万 用英文表达是：tens of thousands of
成千上万的英语：thousands upon thousands（of）、tens of thousands（of）、millions of、tens of thousands of、many thousands。
双语例句 1、成千上万的军民在水坝工地会合。
Thousands of soldiers and civilians assembled 。
成千上万的的英文：thousands of 参考例句：Tens of thousands成千上万The war swept off hundreds and thousands of people.那场战争夺去了成千上万人的生命。
The Great Wall attracts tens of thousands of visitors to。
成千上万tens of thousands of; thousands and tens of thousands of;thousands and thousands of; thousands on (upon) thousands of 旋风给成千上万的人带来苦难。
The cyclone brought misery to thousands of people。