Making art about 9/11 is the ultimate challenge for any artist.
以9-11为主题的艺术作品，对任何一个艺术家来说，都称得上是终极挑战。
How to increase the ultimate recovery factor of oilfield is not only the main problem for oilfield development but also the largest challenge to production engineering.
如何提高油田最终采收率是油田开发面临的主要问题，也是采油工程面临的最大挑战。
This is the ultimate issue which confronts us. For the sake of all that we ourselves hold dear, and of the world order and peace, it is unthinkable that we should refuse to meet the challenge.
这是我们面里的最大的挑战，为了我们所珍视的一切，为了世界的秩序与和平，无法想象我们拒绝迎接这样的挑战。
The collection of these efforts into a unified whole presents the ultimate challenge for the group.
这些努力的集合就构成了一个整体，给整个团体展现最后的挑战。
The collection of these efforts into a unified whole presents the ultimate challenge for the group.
这些努力的集合就构成了一个整体，给整个团体展现最后的挑战。
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