It's just very time consuming to get such a large quantity of data.

要收集这么多的数据就是非常耗时。

《柯林斯英汉双解大词典》

The masks are time-consuming to make, and they're not cheap.

面具的制作很耗时，当然也不便宜。

youdao

But it's also the most difficult and time consuming to construct.

但是构造该模型也是最困难和最耗时的。

youdao

A DNA-based vaccine wouldn't have to be grown in chicken eggs, doing away with the time-consuming and finicky manufacturing process of the current flu vaccine.

VOA: standard.2010.07.21

And frankly it would be incredibly time-consuming and tedious for me, to count this room full of people old school style-- 1, 2, 3 and so forth.

坦白说，按学校的老办法一个人一个人的数,1个，2个，3个……,对我来说极其费时费力。

哈佛公开课 - 计算机科学课程节选

But what this study found was people were asked to estimate how much food they were consuming and how many calories they were burning through physical activity.

但是这个研究发现,当人们被要求估测,他们吃了多少食物,通过体育运动消耗多少卡路里时

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

It can be difficult, expensive, and time-consuming to break into the elite group of foreclosure investors.

FORBES: Better Bargains With Foreclosures and Pre-Foreclosures

It was expensive and time-consuming to reprogram them to do anything else, if it was possible at all.

FORBES: GM Robots Make A 'Wrap' Video

The dead zone drives shrimp farther out to sea, making it costlier and more time-consuming to catch them.

ECONOMIST: Nutrient pollution