When I was hired twenty years ago, the job AD required a J.D., although for years now our library's ads for reference librarians have said only that a J.D. is preferred.
二十年前，我找到这份工作时，该工作就要求法学博士学位，尽管现在我们图书馆招用参考馆员的广告说，持有法学博士学位优先考虑。
Some years ago, Shell carried out a very successful AD campaign in Canada and the US.
数年前，壳牌石油公司在加拿大和美国发起了一个十分成功的广告宣传活动。
A few months ago, I saw an AD in the paper.
几个月之前，我看到一张广告单。
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