在正式会议上，我们必须严格遵守外交礼仪。

During official meetings, we must strictly follow diplomatic ___protocols.

这个应用程序使用安全的通信协议来保护用户数据。

This app uses secure communication ___protocols to protect user data.

所有参与研究的医生都必须严格遵守这些医疗协议。

All doctors involved in the study must strictly follow these medical ___protocols.