词典释义：
[mass noun]the official procedure or system of rules governing affairs of state or diplomatic occasions
国事礼仪；外交礼仪
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protocol forbids the prince from making any public statement in his defence .礼仪禁止王子作任何公开辩护。
the accepted or established code of procedure or behaviour in any group,organization,or situation
（团体、机构或一定情况中的）惯例，习惯做法
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what is the protocol at a smart lunch if one's neighbour dozes off during the speeches? 如果在时髦上层人士午餐会上演讲过程中你的邻座打瞌睡，人们一般该怎样做？
[count noun]
【计 算机】 协议，约定，规程。
the original draft of a diplomatic document,especially of the terms of a treaty agreed to in conference and signed by the parties
（尤指条约的）外交协议草案。
an amendment or addition to a treaty or convention
（协定，公约）修正案（或增补）
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a protocol to the treaty allowed for this Danish referendum .该条约的一项修正为这次丹麦的公民复决开了口子。
a formal or official record of scientific experimental observations
（科学实验结果的）官方记录。
a procedure for carrying out a scientific experiment or a course of medical treatment
（科学实验、医疗的）规程。
"late Middle English （denoting the original minute of an agreement,forming the legal authority for future dealings relating to it）： from Old French
