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

because school can be really challenging and stressful,

因为学校的学习很有挑战性也很有压力，

百慕大出身 - SpeakingMax英语口语达人

And for me it's fun because I may not know the novel that you end up picking, and so it is a kind of challenge for me to take a novel that you've chosen and come to grips with it myself It may be one that I know.

我也觉得很好玩,因为我可能不知道你们最后选择的小说，所以对我来说,认真对待你们选的一本书很有挑战性,可能是一本我知道的书。

耶鲁公开课 - 1945年后的美国小说课程节选

But it was very interesting and challenging.

但我觉得很有意思，很有挑战性。

第二外语，英语 - SpeakingMax英语口语达人

And it's very challenging.

而且也很有挑战性。

学外语的时候 - SpeakingMax英语口语达人