1) 翻译：中国学生申请赴美留学面临的一大障碍是托福考试。
TOEFL is a big hurdle to the Chinese students who want to study in the US.
2) A big hurdle that Chinese students who wish to study abroad face is the foreign language.
3) problem/difficulty 难关
[搭配]ADJ.
big, difficult
大障碍；难关
main, major
主要障碍
final, first, last, next
最后的障碍；第一关；最后一关；下一关
The first big hurdle in putting your car on the road is getting insurance.
让车子上路的第一关就是购买保险。
[搭配]VERB + HURDLE
face 面临障碍
This is perhaps the most difficult hurdle that we face.
这也许是我们遇到的最棘手的难题。
clear, jump, overcome, pass
清除障碍；跨越障碍；渡过难关
We’ll jump each hurdle as we come to it.
我们会跨越我们遇到的每一道难关。
You have already overcome the first major hurdle by passing the entrance exam.
通过入学考试你就已经越过了第一大难关。
fall at 失败
The plan fell at the first hurdle.
这项计划在第一关就败下阵来了。
