Ccsf
[医][=cerebrospinal fluid(drug)concentration]脑脊液（药物）浓度
🗣️ 情景例句
Have you studied any courses related to the post you are applying for?
你曾修读与这份工作有关的科目吗？
Can I have a second-class one way ticket to Chicago,please?
请给我一张去芝加哥的单程二等票好吗？
How long has this factory been open?
这家工厂建成有多久了？