Sym-tetrachlorodifluoroethane
[建] 對稱-四氯二氟乙烷
?? 詞語組成解析
[計] 符號, 系統(tǒng), 制
??? 情景例句
Hi.
嗨。
You have to be there half an hour before departure time.
你要在起飛前半小時到那里。
When they had gone, the driver of the car came towards him.
他們走后，汽車司機(jī)向他走來，