Bcf
[醫][=bacterial chemotactic factor]細菌趨化性因子
??? 情景例句
Well, Mrs. Herrera,
好，Herrera太太
My watch is more expensive because it's a chronometer.
我的手表是精密型的，所以要比你的貴。
Really? What's the trouble?
真的？怎么啦？