Bcf
[医][=bacterial chemotactic factor]细菌趋化性因子
🗣️ 情景例句
It hurts so much when a baby gets his first teeth.
小孩子长第一颗牙齿时好痛哟。
A word spoken is past recalling.
一言既出，驷马难追。
from which can be seen the strata the drill has been cutting through.
从中能看出钻头所钻透的地层。