1
be complex
形容事物由许多部分构成而难以理解。
The problem is very complex.
这个问题非常复杂。
复杂的；难懂的
先理解核心含义，再看它在真实句子里的用法。
复杂的；难懂的
Not simple or easy; complicated.
The problem is very complex.
这个问题非常复杂。
Made up of multiple parts; composite; not simple.
不简单、不易或直接的；复杂的
Not simple, easy, or straightforward; complicated.
Having the form a + bi, where a and b are real numbers and i is (by definition) the imaginary square root of −1.
值域为复数子集的
Whose range is a subset of the complex numbers.
The instructions for assembling the furniture are very complex, with many steps to follow.
组装家具的说明非常复杂，有许多步骤需要遵循。
This mathematical problem is too complex for me to solve without help.
这道数学题太复杂了，没有帮助我解不出来。
The company has a complex organizational structure that spans multiple departments.
该公司拥有复杂的组织结构，涵盖多个部门。
形容事物由许多部分构成而难以理解。
The problem is very complex.
这个问题非常复杂。
They face a complex issue.
他们面临一个复杂的问题。
注意不定式表示结果或能力。
The instructions are too complex to follow.
这些说明太复杂而无法遵循。
This topic is complex for beginners.
这个话题对初学者来说很复杂。
Not this
This problem is complexer than that one.
Use this
This problem is more complex than that one.
形容词 complex 的比较级形式不是 complexer，而是 more complex。这是因为 complex 是多音节形容词，其比较级需要借助 more 构成。
Not this
This is a complex.
Use this
This is complex.
在表示‘复杂的’时，complex 是形容词，不能用作名词。误用为名词会改变词性，导致语义错误（a complex 通常指‘建筑群’）。应使用形容词形式。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
复杂的问题
We are facing a complex problem that requires careful analysis.
我们面临一个需要仔细分析的复杂问题。
复杂的系统
The human brain is a highly complex system.
人脑是一个高度复杂的系统。
复杂的关系
They have a complex relationship that is hard to understand.
他们之间有一种难以理解的复杂关系。
复杂的过程
Learning a language is a complex process.
学习语言是一个复杂的过程。
复杂的问题
Climate change is a complex issue with many factors.
气候变化是一个涉及众多因素的复杂问题。
复杂的结构
The building has a complex structure of steel and glass.
这座建筑有着钢和玻璃构成的复杂结构。
身体是一台复杂的机器。
In the TV show House, Dr. House often describes the human body as a complex machine, emphasizing the challenges of diagnosis.
在电视剧《豪斯医生》中，豪斯医生经常将人体描述为一台复杂的机器，强调诊断的挑战。
想法很简单，执行很复杂。
This line from the movie The Social Network reflects the distinction between a simple concept and the difficult process of implementing it.
电影《社交网络》中的这句台词反映了简单概念与执行复杂过程之间的区别。
Use complex naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
想象许多零件（plex）相互连接（com），构成复杂结构。
常见场景：数学、技术、社会科学、日常问题 通常用于正式或学术语境，但也可用于日常描述复杂问题。
All listed words rhyme with complex (adjective, /kəmˈplɛks/) as they share the stressed /ɛks/ ending. Note that 'convex' may have variable stress; when stressed on the second syllable, it rhymes.
Dictionary facts from ECDICT, WIKTIONARY, WORDNET.