C4
abbr. 补体4（complement 4）
🗣️ 情景例句
Have you discussed going back to work with your boss?
你已跟你的老板讨论过回去工作的事吗？
To sing a song
唱歌
As complaints must be made in writing, the Ombudsman receives an average of 1,200 letters a year.
由于意见均需用书面形式提出，司法特派员每年平均收到1，200封信。