Fluorid
n. 氟化物
??? 情景例句
Dogs make great pets, but don't leave them alone with small children.
狗是最好的寵物，但不要讓狗和小孩子單獨在一起。
He is suffering the humiliation of failure.
他正在蒙受失敗的屈辱。
Think it over.
仔細考慮一下。