Phosphonic
a. 膦的, 膦酸的
🗣️ 情景例句
At today's exercise class...
今天上健身课的时候……
Do you want to airmail it or not?
你想发航空信吗？
He took off the first shoe and threw it on the floor.
他脱下第一只鞋子，把它丢在地板上。