复杂用英语怎么说

复杂用英语可以说是 complex。来源方面，complex 这个词来自拉丁语，原意是 "folded together" 或 "braided"，后来引申为 "complicated" 或 "intricate"。下面给出几个例句：

The system is quite complex, so it may take some time to understand how it works. (这个系统非常复杂，所以理解它的工作方式可能需要一些时间。)

The novel has a complex plot that keeps the reader guessing. (这本小说情节复杂，让读者一直在猜测。)

She has a complex personality, with many different facets. (她的个性复杂，有很多不同的方面。)