Sbf
[医][=serologic-blocking factor]血清封闭因子，血清阻断因子
🗣️ 情景例句
about five years ago.
大约五年前。
It's a shame the weather is so bad.
真遗憾，天气如此糟糕。
But he has not promised to give you any of his blood.
但是他并没有答应给你他身上的任何一滴血。