试试网球、羽毛球或帆板运动。简而言之，任何有挑战性的东西。

Try tennis, badminton or windsurfing. In short, anything challenging.

《柯林斯英汉双解大词典》

但他们的生活里总是有挑战。

But there are also challenges in their lives.

youdao

因为总是有挑战，障碍存在使之未能完美。

There will always be challenges, obstacles and less than perfect conditions. So what.

youdao

Science is very hostile to innovation when it challenges existing theory, sort of like management, the same thing.

科学对创新是有敌意的,当创新在挑战已存在的理论，跟管理一样，同样的道理。

麻省理工公开课 - 固态化学导论课程节选

I think what part of Sustain Dialogue does and just being in community with people it also challenges you. -It does.

我觉得，“持续对话“所做的部分活动,和与你不同的人在一起交流,这很有挑战性，-的确。

普林斯顿公开课 - 人性课程节选

I think this is as good list so let's go and think about what might be a little bit more challenging.

我想上面这些都是很好的例子,接下来我们思考一些更有挑战的问题

耶鲁公开课 - 生物医学工程探索课程节选