Exemption from legal prosecution, often granted a witness in exchange for self-incriminating testimony. 豁免法律诉讼豁免，通常给予目击证人以换取可能归罪于其自身的证词
I gave Mary an apple in exchange for my favorite banana. 我送给玛丽一个苹果换我最喜欢吃的香蕉。
John saved10 cent savings stamps until he had enough to exchange for a$25bond. 约翰储蓄10分钱的储蓄券，一直到他有足够的钱才换成25元的公债券。
An opening in chess in which a minor piece, or pieces, usually a pawn, is offered in exchange for a favorable position. 第一着棋，起手着法国际象棋开局时自愿让出一个或几个小棋子(通常为兵)以交换较有利的形势
