1. I had to decline an invitation to my cousin's wedding because I was abroad.2. He declined a big job offer by a U.S. company because he wants to stay close to his family in Germany.
 decline (politely) refuse politely refuse with courtesydecline 本身就有很有禮貌拒絕別人的意思，但如果你想強調 "禮貌"，後面可加上 politely 之類的副詞。
What have you learned from your friend's drunken car acciden?