Medullation
髓形成, 髓鞘形成
🗣️ 情景例句
Can I borrow your notes to study for the exams?
快考试了，我能借你的笔记看看吗？
No man knows when he shall die, although he knows he must die.
纵然知其难免一死，人却难料何时身亡。
Lucy ran home at once. Her mother saw her when she arrived.
露西马上跑回家。到家时母亲看见了她。