1. Karl Marx was one of those rare men who are fitted for the front rank both in science and in public life.
    卡尔·马克思是那种不可多得的人物，在科学工作和政治生活中都处于先锋地位。

2. His rank is colonel.
    他的军衔是陆军上校。

3. Did you have a high rank?
    你的职位高吗?

4. I need another file for my letters.
    我还需要一个存放信件的夹子.

5. I lost your file by pure mischance.
    我把你的文件弄没了, 纯粹是碰上的倒霉事.