C4
abbr. 补体4（complement 4）
🗣️ 情景例句
What guarantee do I have that it won't break down easily?
有什么保障它不会轻易出故障？
He that goes a borrowing,goes a sorrowing.
向人借债是自寻烦恼。
The examiner must have been pleased with my performance, for he smiled and said.'Just one more thing, Mr.Eames.
“埃姆斯先生，只剩1项了。