Protocols
n. 协议；礼仪礼节；条款（protocol的复数）
🗣️ 情景例句
It's like a special music.
它就像是一种特别的音乐。
You need to transfer at central station.
你必须在中央车站换车。
You might have left it in the shop.
可能你把它落在店里了。