Difluoride
二氟化物
🗣️ 情景例句
May I speak to Miss Tan, please?
可以请谭小姐听电话吗？
I could swear I've been here before.
我敢发誓我曾经来过这儿。
Then they brushed ink on the paper.
然后，他们将墨汁刷在纸上。