Medullation
髓形成, 髓鞘形成
🗣️ 情景例句
Please sit down, Mr. Stewart.
请坐， Stewart先生。
Slowly, mountains are worn away by the wind.
山体逐渐被风化了。
Mrs Flower's house has now been sold.
弗劳尔夫人的房子现已售出。