The paintings are very intricate and they take a lot of work to get right.

这些画是很复杂的，要画好得花很多功夫。

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Once the stuttering habit is ingrained, it will take a lot of work to eliminate it.

一旦弹琴结巴的习惯养成，要摆脱它则是一项巨大工程。

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It can take a lot of work and a significant amount of knowledge to make a useful electronic gadget.

制作一个电子物件需要做很多工作和大量的知识。

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I know it's gonna take me a lot of work on the order of N squared steps to sort these things.

要对它们排序就要进行大量的工作,大概需要N平方步。

哈佛公开课 - 计算机科学课程节选

It's sort of like you just get a lot of work, you take a lot of courses, and

就像你要干的活儿太多，课太多，而且

苦中有乐的学习 - SpeakingMax英语口语达人

Though it can take a lot of work to go through all of them.

BBC: Managing your privacy on Facebook

Open relationships require a lot of talking and ironically, they take a lot of work.

FORBES: On Newt, Cheating And Open Relationships

However, it might take a lot of work to harden systems and ensure they were adequately protected.

BBC: How to hack a nation's infrastructure