courteous

polite, civil, courteous

这些形容词均含“礼貌的、客气的”之意。
polite: 普通常用词，指言论举止无论何时均严谨有礼，很有教养。
civil: 语气弱于polite，着重只达到社交的一般要求，避免粗鲁。
courteous: 指言谈举止典雅，谦恭有礼，更侧重考虑他人的感情与尊严。

形容词 courteous:

1. exhibiting courtesy and politeness
   同义词：gracious, nice
2. characterized by courtesy and gracious good manners-Francis Bacon

1. It behoves you (ie You ought) to be courteous at all times.
   你应当时时刻刻注意礼节。
2. She needed to soften her request to make it as polite and courteous as she could.
   她需要使请求语气柔婉，以便尽可能把它变成有礼貌与客气。
3. A person who is virtuous is also courteous.
   有德者必知礼。
4. Not courteous or in good taste; ungracious.
   没有礼貌的或没有好品味的; 粗野的
5. It was courteous of him to help the old lady with her bundles.
   他很有礼貌地帮助那个老太太扛包裹。