"数十万人"，"数万人"用英语分别怎么说？

如果只是要表达“成千上万”，可以用hundreds & thousands of people

如果要比较确切地表达“数十万”，也可以用several hundred thousand people，“数万”同理。

数十万:hundreds thousand of people
数万:tens thousand of people

1. "数十万人" hundreds of thousands of people
2. "数万人" tens of thousands of people

hundreds of thousands of
tens of thousands of

tens of thousands of people
hundreds of thousands of people
如果不必强调具体数字，直接用thousands of就行了。