翻译

be in his/her element 处于舒适、称意的环境，正是如鱼得水

rest on one's laurels 一个人满足于过去的成就

pay someone back in his own coin 以其人之道，还治其人之身

marriage is for the birds 结婚很无聊

you keep it ！that is for the birds 钱太少了！不值得考虑