Ccsf
[医][=cerebrospinal fluid(drug)concentration]脑脊液（药物）浓度
🗣️ 情景例句
I feel sick as a dog.
我病得很厉害。
By writing you learn to write.
从写作中学写作。
Glancing at it briefly, the dealer told him that it was worth $50.
古董商漫不经心看了一眼那幅画，告诉弗兰克那画值50英镑。