Ccsf
[医][=cerebrospinal fluid(drug)concentration]脑脊液（药物）浓度
🗣️ 情景例句
Can you show me how to apply this make-up correctly?
你能告诉我怎么正确地使用这种化妆品吗？
Oh! Look who's coming?
哟！看看是谁来啦？
Which language is spoken by the largest number of people in the world?
世界上哪种语言说的人最多？