他们自己英语怎么说

"他们自己" 的英语表达是 "themselves"。这个词来自英语中的名词 "themself"（指某人自己）和代词 "self" 的后缀 "-selves"（表示复数）的结合。

例句：

They have to rely on themselves to get the job done.
They enjoy spending time with themselves.
They need to take care of themselves before they can help others.