听力资源简介：

rude　
(a.) 无礼的

It's rude to be late for dinner. Please try to be a little early.
晚餐迟到是很无礼的，请尽量早一点儿到。

polite　
(a.) 有礼貌的

It's polite to say "please" and "thank you."
说‘请’和 ‘谢谢’是很有礼貌的。