英语翻译RTThey come from foreign

They come from foreign countries.

They are foreigners.

They come from abroad.

不妥，foreign是形容词，come from 后面要接名词，所以不行，他们来自外国的，有语病
有2种比较普遍的表达方式，楼主选一个吧
They come from foreign country。
They are foreigners。