Hydroxyfluoride
羟基氟化物
🗣️ 情景例句
Tom, would you give Mr. Johnson Tom
拿给Johnson先生
It must be rather difficult for us to push any sales if we buy it at this price.
如果我们按这个价格购买，将很能难推销。
My grammar is improving, but I find idioms and useful expressions hard to learn.
我的语法在进步，但我发现习语和有用表达很难学。