他们逃避挑战，因为挑战更容易让人犯错。

They avoid challenges because challenges make mistakes more likely.

youdao

我冒着汗水和伤痛打比赛，不是因为挑战呼唤我，而是因为你呼唤我。

I played through the sweat and the hurt, not because the challenge called me, but because you called me.

youdao

因为挑战才是他的人生啊！

Because the challenge is his life!

youdao

Also, shows you something about the challenge of it, because we are susceptible to attack from lots of different kinds of microorganisms.

同样也向你们展示这其中的一些挑战,因为我们也容易受到,各类微生物感染的危害

耶鲁公开课 - 生物医学工程探索课程节选

And also for the challenge factor because they challenge the way I was thinking and writing

还有挑战因素，因为他们挑战了我思考和写作的方式，

怎么协调意见冲突 - SpeakingMax英语口语达人

Because it challenged the whole class system, that people are born into a certain place and cannot-- and should not-- be moved.

因为它挑战了整个阶级体系，人生来就有阶级，不能-,也不应该被改变。

哈佛公开课 - 幸福课课程节选