A transaction is a piece of business, for example, an act of buying or selling something. 交易
noun [专属名词] 交易，买卖，业务；（学术团体会议的）议事录，公报；（人与人之间的）交流，相互影响；事务（元），事项
The transaction is completed by payment of the fee. 交易在支付费用之后就完成了。
