Medullation
髓形成, 髓鞘形成
🗣️ 情景例句
It's common practice.
这是惯例。
Saying is one thing, and doing another.
说是一回事，做是另一回事。
Good idea! That is much better than watching a bad TV programme!
好主意！这比看破电视节目要好多了。