Rarefactions
(rarefaction 的复数) n. 稀薄化, 稀薄\\n[医] 稀疏[状态], 疏松[状态]
🗣️ 情景例句
How about next Saturday?
下周六如何？
If you expect to enter the university,you should apply now.
如果你期望进入大学，你现在应该申请。
No, by air.
不，坐飞机去。