Protocol是一个英文单词，中文翻译为“协议；议定书”。

以下是三个中英文例句：

We need to agree on the terms of the protocol.

我们需要就协议的条款达成一致。

The protocol was signed by representatives of both countries.

该议定书由两国代表签署。

The protocol sets out the rights and obligations of both parties.

该议定书规定了双方的权益和义务。