Protocol is a system of rules about the correct way to act in formal situations.
例句
He has become something of a stickler for the finer observances of royal protocol.他已经变得非常刻板,哪怕是最细微的皇室礼仪也会遵循。...minor breaches of protocol.小小的失礼
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(信息交换)协议
A protocol is a set of rules for exchanging information between computers.
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议定书;协议
A protocol is a written record of a treaty or agreement that has been made by two or more countries.
例句
...the Montreal Protocol to phase out use and production of CFCs...逐步停止使用及生产含氯氟烃的《蒙特利尔议定书》There are also protocols on the testing of nuclear weapons.也有关于核武器试验的协议。
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治疗方案;科学实验计划
A protocol is a plan for a course of medical treatment, or a plan for a scientific experiment.