1. 礼貌;谦恭;彬彬有礼
    Courtesy is politeness, respect, and consideration for others.

courtesy的解释

    e.g. ...a gentleman who behaves with the utmost courtesy towards ladies...
           对女士极有风度的绅士
    e.g. He did not even have the courtesy to reply to my fax.
           他连回复我传真的这点儿礼貌都没有。

2. 礼貌
    If you refer to the courtesy of doing something, you are referring to a polite action.

    e.g. By extending the courtesy of a phone call to my clients, I was building a personal relationship with them...
           通过礼貌性地给客户打电话，我开始和他们建立起私交。
    e.g. At least if they're arguing, they're doing you the courtesy of being interested.
           如果他们在争论，那至少是他们出于礼貌向你表示感兴趣。

3. (正式场合的)客气话，礼貌话
    Courtesies are polite, conventional things that people say in formal situations.

    e.g. Hugh and John were exchanging faintly barbed courtesies.
           休和约翰正说着带有相互挤兑意味的客气话。

4. (服务)免费的
    Courtesy is used to describe services that are provided free of charge by an organization to its customers, or to the general public.

    e.g. A courtesy shuttle bus operates between the hotel and the town.
           有免费班车往返于酒店和市区。
    e.g. ...a courtesy phone.
           免费电话

5. (拜访)礼节性的
    A courtesy call or a courtesy visit is a formal visit that you pay someone as a way of showing them politeness or respect.

    e.g. The President paid a courtesy call on Emperor Akihito.
           总统对明仁天皇进行了礼节性的拜访。

6. (无法律实效的或非正式的)尊称
    A courtesy title is a title that someone is allowed to use, although it has no legal or official status.

    e.g. Both were accorded the courtesy title of Lady...
           两人都被尊称为“夫人”。
    e.g. My title, by courtesy only, is the Honourable Amalia Lovell.
           人们称我为，当然只是出于礼貌，尊敬的阿马利娅·洛弗尔夫人。

7. (用来表示感谢)承蒙…的好意，蒙…提供
    If something is provided courtesy of someone or by courtesy of someone, they provide it. You often use this expression in order to thank them.

    e.g. The waitress brings over some congratulatory glasses of champagne, courtesy of the restaurant...
           女侍者端来几杯饭店赠送的用来庆祝的香槟。
    e.g. Illustrations by courtesy of the National Gallery.
           图片由国家美术馆提供。

8. 作为…的结果;由…引起
    If you say that one thing happens courtesy of another or by courtesy of another, you mean that the second thing causes or is responsible for the first thing.

    e.g. The air was fresh, courtesy of three holes in the roof...
           房顶有3个洞，所以空气很清新。
    e.g. As millions will have seen, by courtesy of the slow motion re-runs, the referee made a mistake.
           慢动作重放后，数百万人都可以看到裁判错判了。