Sbf
[医][=serologic-blocking factor]血清封闭因子，血清阻断因子
🗣️ 情景例句
How do you feel about the last part of the letter?
你对最后一部分有什么看法呢？
It's hard to say.
难说。
Thank you, Mum, for my party, and for my beautiful presents!
妈，谢谢你为我举办聚会，谢谢你送给我美丽的礼物！