Fluorides
n. [无化] 氟化物, 氰化物（fluoride的复数形式）
🗣️ 情景例句
He is behind the rest of the class in reading.
他在阅读方面不如班上的其他同学。
He who hath good health is young,and he is rich who owes nothing.
健康葆青春，无债即富有。
It was the first joy I had known for years.
我豁然开朗了。这是我多年来第一次感到高兴的事了。