1·The assignment on physics is a real challenge.
物理作业是一个真正的挑战。
2·Designing an environmentally friendly airplane is a real challenge.
设计一架环保飞机是一个十足的挑战。
3·The final item is the real challenge.
最后一项是真正的挑战。
4·The real challenge is getting a good job.
真正的挑战是如何得到一份好的工作。
5·The real challenge, though, is to keep digging.
但是，真正的挑战是持续挖掘。
6·The real challenge is to not block out everything else.
真正的挑战是不要阻止那些发生在你身边的每一件事。
7·It's a real challenge, but it's something that is do-able.
这确实是一个挑战，但仍然有可能完成。
8·That is the real challenge or "test" you are actually facing.
这就是你所面临的真正挑战。
9·Exploring the outer space is a real challenge to mankind.
探索外层太空对人类是真正的挑战。
10·"The real challenge is matching supply with demand," Jacobson says.
“真正的挑战是供给跟上需求，”雅格布森说。