Ccsf
[医][=cerebrospinal fluid(drug)concentration]脑脊液（药物）浓度
🗣️ 情景例句
Small world. I'm from Titusville, too.
世界真小。我也是从Titusville来的。
He did not conclude that Anna had misunderstood.
他没法断定安娜是否存在误解。
It was your turn to wash them yesterday.
昨天轮到你把它们洗干净。