Fluorides
n. [无化] 氟化物, 氰化物（fluoride的复数形式）
🗣️ 情景例句
Don't worry about it.
别放在心上。
One swallow does not make a summer.
一燕不成夏。
Did she learn all by herself? How clever.
她全是自己学会的吗？多么聪明啊！