as a courtesy
用于说明某行为是出于礼貌或好意，而非义务；常见于服务和商务场合。
The hotel provides a free shuttle as a courtesy to its guests.
这家酒店免费提供班车，作为对客人的礼遇。
礼貌的举动；客气话；礼节性表示；好意；慷慨（提供所需）；宽容；纵容；非原则性的默许；鳏夫对亡妻不动产或继承财产的终身权益；礼貌行为。
polite behavior or manner
礼貌行为。
Polite behavior.
礼貌、尊敬或体贴的行为
a courteous or respectful or considerate act
礼貌的举动或言辞,尤其是相对于义务或标准做法。
A polite gesture or remark, especially as opposed to an obligation or standard practice.
礼貌、尊敬或体贴的言语
a courteous or respectful or considerate remark
尽管事实如此,仍然同意或接受；宽容。
Consent or agreement in spite of fact; indulgence.
礼貌的态度
a courteous manner
在提供所需物品方面的乐意或慷慨。
Willingness or generosity in providing something needed.
遗孀在其妻子的真实或可继承财产中享有的终身权益。
The life interest that the surviving husband has in the real or heritable estate of his wife.
She held the door open for the man behind her as a courtesy.
她出于礼貌，为身后的男士扶住了门。
用法提示：courtesy 为名词，表示“礼貌的举动”，在句中作介词 as 的宾语。
It's common courtesy to reply to an invitation within a few days.
几天内回复邀请是基本的礼貌。
用法提示：courtesy 此处为不可数名词，表示“礼貌、礼节”，作表语。
The host's small courtesies made everyone feel welcome.
主人的一些小礼节让每个人都感到受欢迎。
用法提示：courtesies 是 courtesy 的复数形式，指“礼貌的举动”。
用于说明某行为是出于礼貌或好意，而非义务；常见于服务和商务场合。
The hotel provides a free shuttle as a courtesy to its guests.
这家酒店免费提供班车，作为对客人的礼遇。
表示某物由某人或某机构免费提供或赞助；照片、活动等也常用这个说法。
The refreshments are courtesy of the local bakery.
茶点由当地那家面包店免费提供。
表示“有礼貌地做某事”，多用于否定句，强调对方连基本的礼貌都没有。
He didn't even have the courtesy to reply to my email.
他甚至没有礼貌性地回复我的邮件。
表示对某人表现出礼貌和尊重；此义项下 courtesy 通常不可数。
Good hosts always show courtesy to their guests.
好的主人总是对客人以礼相待。
grammar · medium
易错句子He is very courtesy to everyone.
正确表达He is very courteous to everyone.
courtesy 是名词，不能放在系动词 be 后作表语描述人的品性；表示“有礼貌的”要用形容词 courteous（同义于 polite）。中文“他很礼貌”中的“礼貌”既可作名词也可作形容词，因此容易直接把名词 courtesy 当形容词用。
grammar · medium
易错句子He showed me many courtesy during my stay.
正确表达He showed me many courtesies during my stay.
many 只能修饰可数名词复数，此处 courtesy 指一次次的“礼貌举动、客套话”，是可数用法，须用复数 courtesies（辅音字母 + y 结尾，变 y 为 i 再加 -es）。汉语名词不标复数，所以学习者容易漏掉 -ies。
grammar · medium
易错句子These photos are courtesy by the local museum.
正确表达These photos are courtesy of the local museum.
表示“由……提供、承蒙……允许”时，courtesy 与介词 of 构成固定搭配 courtesy of，不能用 by。汉语“由某方提供”对应“由”，容易让学习者误选 by。
起码的礼貌；人人都应有的礼节
It's common courtesy to thank someone who helps you.
对帮助过你的人道谢是起码的礼貌。
承蒙……的好意；由……免费提供
The refreshments were provided by courtesy of the hotel.
茶点由酒店免费提供。
礼节性拜访；礼节性致电
The new manager made a courtesy call on our department.
新经理到我们部门做了一次礼节性拜访。
出于礼貌
I accepted the invitation out of courtesy, not because I wanted to go.
我接受邀请是出于礼貌，并不是因为想去。
同行之间的礼节；职业上的客气
The doctor charged no fee as a matter of professional courtesy.
出于同行间的礼节，这位医生没有收费。
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礼节性头衔（虚衔）
“Doctor” here is just a courtesy title.
这里的“Doctor”只是个礼节性头衔。