Difluoride
二氟化物
🗣️ 情景例句
One week after I have submitted my resignation paper.
在我提交辞职信一星期后吧！
Fred will be happy to come to your party.
佛列德可能欣然去参加你的派对。
Take a deep breath and I'll time you. But don't drown!
深吸一口气，我来给你计时。但别淹着！