Difluoride
二氟化物
🗣️ 情景例句
I'll have to go home.
我必须回家一趟。
May I come in?
我能进来吗？
I bound the base of the tree with sticky tape, making it impossible for the ants to reach the aphids.
我用一条胶带把桃树底部包上，不让蚂蚁接近蚜虫。