Fluoridating
v. 在飲水中加少量之氟（以防兒童蛀牙）( fluoridate的現在分詞 )
??? 情景例句
May I speak to the head of the household?
我可以請戶主聽電話嗎？
Easy to please.
知足常樂。
The children started to walk around the island.
孩子們開始繞著小島散步。