intermingle

In her short stories, science fiction and romance are intermingled. = In her short stories, science fiction is intermingled with romance.她的短篇小说里，科幻和言情混杂在一起。

In her short stories, science fiction and romance intermingle.她的短篇小说里，科幻和言情混杂在一起。

The colors intermingle perfectly (with each other) in the painting.这幅画里，各种色彩完美地（相互）融合在一起。