Although it is challenging to work in Antarctica, scientists' passion to learn about this mysterious land will never end.

虽然在南极洲工作极具挑战性，但科学家们对这片神秘土地的热情永不停歇。

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Being part of the background in a convincing (令人信服的) way is challenging, and being on a film or TV set is always fascinating.

以一种足够令人信服的方式成为时代的背景是极具挑战性的，而成为电影或电视的主角又很令人向往。

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"Although the job is challenging, risky and dangerous, there is nothing more I would rather do," Jing Haipeng, 50, who is commander of this mission, told reporters.

50岁的景海鹏是这项任务的指挥官，他告诉记者：“虽然这项工作具有挑战性、风险性和危险性，但我没有其他更愿意做的事了。”

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"And the brain is activated by this challenging environment and signals to the fat to stop the release of this hormone.

VOA: standard.2010.07.14

What we've seen is a testing of the system -that we have regulatory requirements, that banks have enough capital -but this regulation is challenging because it's being stressed right now.

我们列举的这些案例都是对银行体系的考验,我们需要加强监管,以确保银行有充足的资本,但监管确实是一项艰巨的任务,因为现在面对的压力更大了

耶鲁公开课 - 金融市场课程节选

We're still close enough to the summer that the air is not just filling us up with extra static electricity, so it's a little more challenging here.

我们现在离夏天更近了,这样空气中不总是,充满额外的静电，所以这时做实验,会有一些挑战性。

麻省理工公开课 - 化学原理课程节选

But pinning mofongo to a specific place in Puerto Rico is challenging, if not outright impossible.

BBC: On the mofongo trail in Puerto Rico

Mr Trump is challenging the Scottish government's decision to grant planning permission for the wind farm.

BBC: Photomontage of planned turbines

Today, China is challenging the US in the number of new biotechnology companies created annually.

FORBES: Legendary Drug Industry Executives Warn U.S. Science Cuts Endanger The Future