Phosphonic
a. 膦的, 膦酸的
🗣️ 情景例句
Sir, everything now is offered with a great discount.
先生，所有的东西都在打很大的折扣。
How long will it take you to make it?
你要多久才能做好它？
7 p.m. Will you be free then?
晚上7点。那时你有空吗？