例句　They have a reciprocal agreement to combat terrorism.
他们有相互配合的协定，共同与恐怖主义作斗争。
衍生　 reciprocality n. 双方；互惠 reciprocally adv. 相互地，彼此地
翻译　Although I gave him many presents, I had no reciprocal gifts from him（我没有收到过他给我的礼物）.
同义替换　mutual adj. 相互的 correlative adj. 相关的；关联的
decline [d??kla?n] n. 下降；衰退 v. 下降；衰落；谢绝；婉拒
拆分　de（向下）+ cline（倾斜，斜坡）→倾斜，衰退
例句　It has seen a steady decline in its profits.
它的利润下降很平稳。
翻译　He declined to attend the meeting.（他拒绝参加会议。）