Daso
[醫][=diamylsulfoxide]二戊亞砜
??? 情景例句
He is a good speaker of English.
他英語說得非常流利。
It's earier to run down the hill than go up.
下山容易上山難。
Really? I thought you were from the States.
真的嗎？我還以為你是美國人呢。