Ccsf
[医][=cerebrospinal fluid(drug)concentration]脑脊液（药物）浓度
🗣️ 情景例句
There are many natural catastroophes occurring in nature.
自然界里有很多自然灾害发生。
I saw him at the supermaket.
我在超级市场看到他。
She picked it up and gave it back to me.
她把它捡起给了我。