C4
abbr. 补体4（complement 4）
🗣️ 情景例句
Well, at one o'clock
嗯， 一点钟
Hawaiians are used to the rumblings of the volcano.
夏威夷的人已经习惯于火山的爆发声了。
I was waiting for the sound of the other shoe!
我一直在等待另一只鞋落地的响声！