courtesy
/ˈkɜːtɪsɪ/noun
(pl. -ies)［mass noun］
1- the showing of politeness in one's attitude and behaviour towards others有礼貌; 谦恭：
he had been treated with a degree of courtesy not far short of deference.
他受到的礼遇近乎敬重。
1.1
- count noun（常作 courtesies）a polite speech or action, especially one required by convention（尤指社会习俗要求的）谦恭有礼的言语（或行为）：
the superficial courtesies of diplomatic exchanges
外交交锋中表面上的彬彬有礼。
1.2
- as modifier(especially of transport) supplied free of charge to people who are already paying for another service（尤指交通运输）免费的：
he travelled from the hotel in a courtesy car.
他乘坐免费接送车离开旅馆。
1.3
- count noun archaic a curtsy〈古〉屈膝礼。
短语
by courtesy
- as a favour rather than by right出于好意; 出于礼貌：
he was not at the conference only by courtesy.
他出于好意才没有参加会议。
(by) courtesy of
1
- given or allowed by由…提供; 蒙…允许：
photographs courtesy of the Evening Star
《星晚报》提供的照片。
1.1
- informal as a result of; thanks to〈非正式〉作为…的结果; 因为, 由于。
词源
Middle English: from Old French cortesie, from corteis （see COURTEOUS）.