Realize that there's an inevitably challenge for us and actually helping people in this kind of context, especially as the deadline really approaches.

这对我们来说是一个不可避免的挑战,需要在这种环境下帮助人们，特别是当最后期限要接近了。

哈佛公开课 - 计算机科学课程节选

It's a material force that his rhetoric challenges and relies on, gives him a means of getting off the ground, and a means of always getting back to it, too.

这是他的修辞所挑战的并且依赖的物质力量，这种力量给他离开地面的方法，也给他回到地面的方法。

耶鲁公开课 - 现代诗歌课程节选

And part of what happens in a place like Princeton is that people get challenged. -Right.

而且，在普林斯顿这种地方,人们处处都会遇到挑战，-是的。

普林斯顿公开课 - 人性课程节选