Difluorene
[化] 联芴
🗣️ 情景例句
Thank you for inviting me to you wedding.
谢谢你邀请我参加你们的婚礼。
The tour will take about an hour and a half. We ought to be back here by 3:00.
参观大概要一个半小时，3点钟以前回到这里。
which we may call respectively the tough and the gentle.
我们分别称之为强硬法和温柔法。