Perhalogeno-
[化] 全卤(代)(代替所有C上的氢)
🗣️ 情景例句
Hi, Alexandra. Welcome.
嗨 Alexandra。欢迎。
Do you want to airmail it or not?
你想发航空信吗？
They will be coming by train and most of the young people in the town will be meeting them at the station.
他们将乘火车来，镇上的大部分青年人将到车站迎接他们。