C4
abbr. 补体4（complement 4）
🗣️ 情景例句
Do you mind if I pay in cash?
你介意我付现金吗？
I can see the brown wall of dust coming toward us with the wind.
风卷起褐色的墙壁似的滚滚黄沙，向这里袭来。
The product gives you an edge over your competitors,I guess.
我认为你们的产品可以使你们胜过竞争对手。