Phosphonate
膦酸盐, 膦酸酯
🗣️ 情景例句
First, we have to catch some fish.
首先 ，我们得钓几条鱼。
When three know it, all know it.
三人知，天下晓。
Today is Thursday, September 10th, Teachers' Day.
今天是9月10日，星期四，教师节。