永远也别插队，那是非常没有礼貌的行为。

Never cut in a line. That is very rude.

youdao

在学校里，老师和同学们都被认为是有礼貌的行为。

At school, greeting teachers and schoolmates is considered polite behavior.

youdao

对不会说你的母语的外国人进行嘲笑是没有礼貌的行为。

It is rude to make fun of some one because he or she is a foreigner and they can't speak your language.

youdao