1
fluoride in [something]
fluoride 通常作不可数名词；指不同种类的氟化物时可用复数 fluorides。
The amount of fluoride in the water is carefully controlled.
水中氟化物的含量受到严格控制。
氟化物
先理解核心含义，再看它在真实句子里的用法。
氟化物
a salt of hydrofluoric acid
The amount of fluoride in the water is carefully controlled.
水中氟化物的含量受到严格控制。
氟与另一种元素或基团形成的二元化合物。
A binary compound of fluorine and another element or radical.
氢氟酸的盐
a salt of hydrofluoric acid
氟原子的阴离子形式。
The anionic form of a fluorine atom.
Our toothpaste contains fluoride, which helps protect teeth from decay.
我们的牙膏含有氟化物，有助于保护牙齿免受蛀蚀。
The dentist recommended a mouthwash that has fluoride for extra protection.
牙医推荐了一款含氟化物的漱口水，以提供额外保护。
Some towns add fluoride to their drinking water to improve dental health.
一些城镇在饮用水中添加氟化物，以改善牙齿健康。
fluoride 通常作不可数名词；指不同种类的氟化物时可用复数 fluorides。
The amount of fluoride in the water is carefully controlled.
水中氟化物的含量受到严格控制。
Some cities add fluoride to their tap water.
一些城市在自来水里添加氟化物。
Not this
This toothpaste contains flouride.
Use this
This toothpaste contains fluoride.
拼写错误：氟化物的英文是 fluoride，不要与 flouride 混写，注意字母顺序。
Not this
Fluorine is added to drinking water to prevent cavities.
Use this
Fluoride is added to drinking water to prevent cavities.
词义混淆：fluorine 指氟元素，fluoride 指氟化物。饮用水中添加的是氟化物，而不是氟单质。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
氟化钠
Sodium fluoride is often added to drinking water to prevent tooth decay.
氟化钠常被添加到饮用水中以预防蛀牙。
含氟牙膏
Dentists recommend brushing with fluoride toothpaste twice a day.
牙医建议每天使用含氟牙膏刷牙两次。
氟化物治疗；涂氟
The dentist gave my son a fluoride treatment after his checkup.
牙医在检查后给我儿子做了涂氟治疗。
氟保护漆
Fluoride varnish helps prevent cavities in children's teeth.
氟保护漆有助于预防儿童蛀牙。
氟化物摄入
Too much fluoride intake can cause dental fluorosis.
氟化物摄入过多会导致氟斑牙。
Use fluoride naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
记忆：fluoride 听起来像 flu（流感）+ ride（骑），想象‘骑着氟化物赶走蛀牙菌’，帮你记住它是氟化物。
语域：neutral 常见场景：牙科与口腔护理、饮用水与公共健康、化学或工业场景 该词常作为标准科技用语使用，在牙科和公共健康讨论中也很常见；通常属于中性正式表达，无明显口语或俚俗色彩。
这些词都以 -ide 结尾，词尾发音均为 /aɪd/，与 fluoride 末尾的 /raɪd/ 一致。但注意，fluoride 的重读元音是 /ʊ/，因此严格来说这些词并不与 fluoride 押韵。拼写相似的 chloride /ˈklɔːraɪd/、bromide /ˈbroʊmaɪd/ 虽然都以 -ide 结尾，但元音和重音位置不同，不要混淆。
Dictionary facts from ECDICT, WIKTIONARY.