C4
abbr. 补体4（complement 4）
🗣️ 情景例句
Here they are. Family Album, U.S.A.
就在这里。美国写真！
One drop of poison infects the whole tun of wine.
一滴之毒，毒染整桶之酒。
The towers are further apart at the top than at the base, but this is no mistake.
两座塔楼的楼顶之间的距离比楼底之间的距离要大一些，但是这并不是错误。