7. vain a. 徒劳的,无效的
All his father's exhortations were in vain.
他父亲的一切劝告都无效。
We tried in vain to make him change his mind.
我们想使他改变主意,结果是白费心机。
8. undertake vt. 承担,着手做;同意,答应
We could undertake the work for the time being.
我们可暂时承担这项工作。
Whatever I may undertake in the coming years, I don't need your help.
未来无论我从事什么,我都不需要你的帮助。
He undertook to finish the job by Friday.
他答应星期五之前完成这项工作。
9. unique a. 唯一的,独特的
He occupies a unique place in English literature.
他在英国文学中占有独特的地位。
It's a unique work of art.
这是独一无二的艺术作品。
10. obstacle n. 障碍(物),妨碍
Lack of education is an obstacle of success.
缺乏教育是成功的障碍。
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