Fluorides
n. [无化] 氟化物, 氰化物（fluoride的复数形式）
🗣️ 情景例句
I have two days off a week.
我一星期休息两天。
I'll pick up ticket at the airport counter.
我会在机场柜台拿机票。
The men got such a fright that they dropped the bag and ran away.
这两个人吓了一跳，扔下提包逃跑了。