Rarefication
n. 变稀薄, 稀薄
🗣️ 情景例句
He is in trouble all the time.
他总是有麻烦。
He already has a phonograph,but he doesn't have a radio yet.
他已经有一架留声机，但是他还没有收音机。
Just like London!
就像伦敦一样！