C4
abbr. 补体4（complement 4）
🗣️ 情景例句
I just can't understand
我就不懂
It is an ill bird that fouls its own nest.
家丑不可外扬。
Snakes did not acquire their poison for use against man but for use against prey such as rats and mice, and the effects on these of viperine poison is almost immediate.
因为蛇有毒液不是用来对付人的，而是对付它的猎物，诸如鼠类，毒液对这些猎物会立刻起作用。