polite

/pəˈlaɪt/

showing regard for others in manners, speech, behavior, etc.

中文释义：有礼貌的；客气的

It is polite to say 'thank you' when someone helps you.

当别人帮助你时，说声“谢谢”是有礼貌的。

The young man was very polite and held the door open for the elderly woman.

那个年轻人很有礼貌，为老妇人扶着门。