Medullation
髓形成, 髓鞘形成
🗣️ 情景例句
International travel involves a lot of waiting around in airports.
经常在机场等候是环球旅行的一部分。
Certainly not.
一定不是。
Really? If you are ill, you must see the doctor.
真的吗？如果是生病了，你得去看医生。