Medullation
髓形成, 髓鞘形成
🗣️ 情景例句
When you go to a new school it takes a while to know the ropes.
到一所学校读书要花一段时间熟悉情况。
This composer is writing beautiful song.
这位作曲家写出了美妙的歌曲。
The wheels scooped up stones which hammered ominously under the car.
车轮搅起的石块锤击车身，发出不祥的锤击声。