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1·I buy you lunch and you fix my computer. Is that a fair exchange ?

我请你吃午饭，你给我修计算机，这算是公平交易吧？《牛津词典》

2·A fair exchange is no robbery.

公平交易并非抢夺。

3·This is not a fair exchange.

这项交易不公平。

4·It's a fair exchange.

我是公平交换。

5·Is five apples for five eggs a fair exchange?

用五个苹果换五个鸡蛋公平吗？

6·Finally, gives a test instance to show how this fair exchange works.

最后，以一个公平交换的实例来展示平台中的这项功能。

7·Certified mail protocol is fair exchange of a message m for a receipt.

认证邮件协议，指一个发送方要将消息M与收方收到的证据进行交换的协议。

8·Fair exchange means that two parties exchange digital signatures fairly over Internet.

公平交换即允许双方在因特网上公平地交换数字签名。

9·This paper presents an anonymous fair exchange E-commerce protocol based on multi-bank.

提出了一种基于多银行的、匿名的、公平的电子商务协议。

10·Afterwards, a novel fair exchange protocol totally based on RSA signature scheme is devised.

在此工作的基础上，设计了一种基于RSA密码体制的最优化公平交换协议。