Rarefication
n. 变稀薄, 稀薄
🗣️ 情景例句
Don't drink the tap water.
别喝自来水。
So far I have been learning about China.
到止前我止，我一直都在研究中国的事情。
The operation, which lasted for over four hours, proved to be very difficult because of the hard resin which covered the skin.
手术持续了4个多小时，非常难做，因为皮肤上覆盖着一层硬硬的树脂。