Florocid
氟化钠
🗣️ 情景例句
Haven't we met someplace before?
我们以前没见过面吗？
How much is a one-way ticket?
单程车票多少钱一张？
Thank you, Mum, for my party, and for my beautiful presents!
妈，谢谢你为我举办聚会，谢谢你送给我美丽的礼物！