请不要复制词典的内容！最好给出一些例子来，谢谢！
complex指组成某种机器的零件、构成某件事的因素或构成数学题的元素不仅很多，而且相互的关系或相互的作用也令人眼花缭乱，只有学识深的人或具有专门知识的人才能处理。
the complex mechanism of a watch
手表的复杂结构
the complex modern world
复杂的现代世界
Justice is part of the complex machinery of the law.
正义是复杂的法律机器的一部分。
He mentally visualizes a complex form all round itself.
他在脑海里从形体的各个方面来模拟复杂的形体。
complicated 具有complex的一切意义，但更强调复杂得难以解释或理解。一道算式题可能非常 complex,但未必确实complicated；而一道 complicated 算式一般总是 complex的。
The old view of Galileo was delightfully uncomplicated.
过去对伽利略的看法并不复杂(指不深奥)，这是令人欣然的。
The apparatus thus described, however, records only the horizontal component of the wave movement.
然而，仪器的如此描画只记录下波的运动的水平组成部分，但是事实上波的运动要复杂得多（指不易解释）。
intricate 通常指交织在一起的众多因素，而且很难理出头绪来。
The child was perplexed by the intricate plot of the story.
这孩子被那头绪纷繁的故事弄得迷惑不解。
involved 通常指许多事物或事物的关系盘根错节。
These are involved financial affairs.
这是些错综复杂的金融事务。
knotty 指充满纠缠不清、令人困惑的复杂问题，而且包含着几乎不可能解决或弄懂的意义。
This is a knotty passage.
这是一段复杂难懂的文字。
参考资料：词霸
本回答被提问者采纳complex为常用词，表示由一些互相联系，互相作用的部分组成,需要有相当的研究，知识和经验才能理解、操作或处理。
complicated为正式用词，表示由于组成部分太多，互相关系太复杂而不能马上理解，预期比comlex更重。
complex： 侧重内在关系的复杂，需通过仔细研究与了解才能掌握和运用。
complicated： 与complex的含义接近，但语气更强，着重极其复杂，很难分析、分辨或解释。
先给个英语定义和解释：
Complex means that something has many parts. Complexity does not imply difficulty.
Complicated refers to a high level of difficulty. If a problem is complicated, there might be or might not be many parts but it will certainly take a lot of hard work to solve.
Complex 这种复杂性意味着这个东西有很多部分，但这个复杂性并不意味着困难。
Complicated 指的是高难度的那种“复杂”。这种复杂不来自东西的 “多部分性”，而来自事情的需要很多的努力工作来解决。
拓展资料：
complicated意思是构造复杂的，错综复杂的，或者难懂的，难理解的。
complex 则偏向于由部分合成的，复合的；
eg: complex number 复数。
complicated和complex的区别：词意思的差别及用法不同。
1、complex：暗示相关部分的关系;
例句：
The composer transformed a simple folk tune into a complex set of variations.
这位作曲家把一首简单的民歌小调改编成一首复杂的变奏曲.
To one could soar into a more intricate labyrinth of refined phraseology.
“没有人能够攀进复杂的专业术语的优雅迷宫”（安东尼;初蒲）.
2、complicated强调各部分之间的细微关系;
例句：
Middle Eastern politics is so complicated that even experts cannot agree on a cohesive policy.
中东政治如此复杂以致于甚至专家们也难以制定出统一的策。
拓展资料
一、complicated
音标：英 [ˈkɒmplɪkeɪtɪd] 美 [ˈkɑ:mplɪkeɪtɪd]
词性：
adj.
结构复杂的;混乱的，麻烦的
v.
使复杂化( complicate的过去式)
双语例句：
1、The situation in Lebanon is very complicated.
黎巴嫩的情况十分复杂。
2、The problem became even more complicated.
问题更复杂了。
3、The problem is not as complicated as he imagined.
问题没他想像的那么复杂。
4、It is a complicated problem.
这个问题错综复杂。
5、I will tell you, sooner or later, all the complicated process.
我迟早要把这一复杂的过程全部告诉你。
二、complex
音标：英 [ˈkɒmpleks] 美 [kəmˈpleks]
词性：
adj.
复杂的;难懂的;复合的
n.
情结;建筑群;相关联的一组事物;不正常的忧虑
双语例句：
1、I have never had a complex about my height.
我从来没有担心过自己的身高。
2、The various systems are coupled together in complex arrays.
多个系统在复杂的数组中连接起来。
3、This project involves a lot of complex technical problems.
这个方案牵涉到许多复杂的技术问题。
4、As the world becomes more complex, some things do, of course, standardize and globalize
随着世界变得日益复杂，某些事物确实理所当然地规范化和全球化了。
5、The students work in groups on complex problems.
学生们分组研究复杂的问题。
2.complex指“包含许多（尤其是不同的）部分， 因而比较难懂或难解释的”， 如：This is a complex problem. 这是一个复杂的问题。complicated 指“各部分相互交错而变得错综复杂”， 如：What a complicated machine! I can\'t possibly use it. 这是一台多么复杂的机器！ 我可不会使用它。
These come from
complicate
verb [T]
1 to make something more difficult to deal with, do or understand:
It will only complicate the situation if we invite his old girlfriend as well.
The rescue operation has been complicated by bad weather.
These new rules have complicated the tax system even further.
2 If one illness complicates another illness, it makes the other illness worse:
The breathing problem has now been complicated by a chest infection.
complicated
adjective
involving a lot of different parts, in a way that is difficult to understand:
complicated instructions
I had to fill in this really complicated form.
The rules are rather complicated to follow.
The relationship is a bit complicated. He's my mother's cousin's daughter's child.
complication
noun
1 [C or U] something which makes a situation more difficult, or when it does this:
Dave couldn't find his passport at the airport and then there were further complications when Fiona lost her baggage.
If any complications arise, let me know and I'll help.
2 [C] an additional medical problem which makes it more difficult to treat an existing illness:
If there are no complications, the doctor says that she'll be able to come home within two weeks.
complex (HAVING MANY PARTS)
adjective
1 involving a lot of different but related parts:
a complex molecule/carbohydrate
a complex network of roads
a complex procedure
The company has a complex organizational structure.
2 difficult to understand or find an answer to because of having many different parts:
It's a very complex issue to which there is no straightforward answer.
The film's plot was so complex that I couldn't follow it.
complexity
noun [C or U]
a problem of great complexity
There are a lot of complexities surrounding this issue.
complex (BUILDING)
noun [C]
a large building with various connected rooms or a related group of buildings:
a shopping/sports and leisure complex
US They live in a large apartment complex.
complex (BAD FEELING)
noun [C]
a particular anxiety or unconscious fear which a person has, especially as a result of an unpleasant experience that they have had in the past or because they have a low opinion of their own worth, and which influences their behaviour:
an inferiority complex
I think he's got a complex about being bald.
Don't go on about her weight - you'll give her a complex!
