Medullation
髓形成, 髓鞘形成
🗣️ 情景例句
I feel sick as a dog.
我病得很厉害。
I think she works much too hard.
我认为她未免太过辛劳了。
They teach us Chinese and we teach them English. Please write soon!
他们教我们汉语，我们教他们英语。请赶快回信。