Prodan
氟硅酸钠
🗣️ 情景例句
Before the barbeque let's sharpen all the knives.
烧烤之前先把刀磨一磨。
Did you see the special last night?
昨晚你看特别节目了吗？
Some of them are going to the park.
他们中有几个正走进公园。