Perhalogenomethane
全鹵甲烷
??? 情景例句
Hi, I'm just calling to see if you got home s afely last night.
你好，我打電話來確定一下你是否已經安全到家。
May I come in?
我能進來嗎？
the varieties are infinite; but two classes may be roughly seen.
鳥的飛行方式千差萬別，但大體上可分為兩類。