It's a complex activity that requires a lot of intellectual effort.
这是一项复杂活动，需要大量的知识积累。
It is a complex yet stimulating book.
这是一本复杂却能引发兴趣的书。
Ritter was a very complex man but Marius was the opposite, a simple farmer.
里特是个非常复杂的人，而马里厄斯则恰恰相反，是个单纯的农民。
They occur in separate zones in a complex glass flow driven by high temperatures.
在高温驱动的复杂玻璃流中，它们出现在不同的区域。
蜡是一种复杂的混合物。
Using data is a complex business.
使用数据是一项复杂的工作。
Reflection on a complex task such as teaching is not easy.
对教学这样一种复杂的任务进行反思是不容易的。
This is a complex issue and we need to take it seriously.
这是一个复杂的问题，我们需要认真对待。
This makes commercial space travel a complex legal issue not just domestically, but abroad.
这使得商业太空旅行成为一个复杂的法律问题，在国内外皆是如此。
Douglas was a complex man, thoughtful, gallant, and generous.
道格拉斯是个复杂的男人，他体贴、殷勤而且慷慨。
It's a complex issue, but he only sees it in black and white.
那是个复杂的问题，但他却只看到对与错的分别。
It's a useful introduction to an extremely complex subject.
这是对一门极为复杂的学科的有益入门教程。
It is a complex system, but it certainly makes a change.
这是个复杂系统，但肯定有所改进。
You cannot do justice to such a complex situation in just a few pages.
你不可能仅仅几页就将这么复杂的形势恰如其分地描述出来。
As a relationship becomes more established, it also becomes a good deal more complex.
当一段关系固定下来以后，它也会变得复杂得多。
The architect had produced a scale model of the proposed shopping complex.
建筑师为提议建设的购物中心做了一个比例模型。
We next had to navigate a complex network of committees.
我们下一步必须设法使各级委员会予以通过。
U.S. troops surprised eight enemy fighters in a cave complex.
美国军队在一个洞穴群里出其不意地抓获了8名敌军士兵。
This is just one of a whole complex of issues.
这仅仅是所有相关的问题之一。
This project involves a lot of complex technical problems.
这个项目涉及许多复杂的技术问题。
People are living longer with a lot more complex needs.
人们的寿命越来越长，需求越来越复杂。
First, people are living longer with a lot more complex needs.
首先，人们的寿命越来越长，需求越来越复杂。
Driving is a complex task that takes humans a long time to perfect.
驾驶是一项复杂的任务，人类需要很长时间才能完全掌握。
Once we got a good look inside, we saw a really complex device.
在仔细地观察了其内部结构以后，我们发现，这是一个十分复杂的装置。
A gonadoblastoma is a complex neoplasm.
淋巴母细胞瘤是一种复杂的肿瘤。
This is a complex undertaking.
这是一项复杂的任务。
It is a complex computer simulation. That in itself is a complex computer simulation.
这一过程本身，就是一个非常复杂的计算机模拟过程。
You're right, this is a complex undertaking.
你们说得对，这是一件复杂的事情。
Managing people is a complex business.
管理人是一项复杂工作。
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