Subfluoride
低氟化物, 氟化低价物
🗣️ 情景例句
It's not an important game, anyway.
话说回来， 这场比赛不重要。
I have a tactical idea.
我有一个高明的计策。
The English and Maths papers weren't easy enough for me.
英语和数学试题对我来说不很容易。