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exposure to formaldehyde
exposure to 是固定搭配，to 为介词，后接名词。
Prolonged exposure to formaldehyde may cause irritation.
长期接触甲醛可能引起刺激。
甲醛
先理解核心含义，再看它在真实句子里的用法。
甲醛
a colorless poisonous gas produced by oxidizing methanol
Prolonged exposure to formaldehyde may cause irritation.
长期接触甲醛可能引起刺激。
The simplest aldehyde, HCHO, a colourless gas that has many industrial applications; it dissolves in water to give formol (10%) and formalin.
The lab technician stored the formaldehyde in a sealed glass bottle.
实验室技术员把甲醛储存在密封的玻璃瓶里。
Formaldehyde has a sharp, unpleasant smell even at low concentrations.
即使在低浓度下，甲醛也有刺鼻难闻的气味。
Some furniture glues release small amounts of formaldehyde into the air.
一些家具胶水会向空气中释放少量甲醛。
exposure to 是固定搭配，to 为介词，后接名词。
Prolonged exposure to formaldehyde may cause irritation.
长期接触甲醛可能引起刺激。
contain 是及物动词，直接接宾语，不接介词。
Some paints contain formaldehyde.
有些油漆含有甲醛。
表示“甲醛浓度”时，levels 常用复数。
High formaldehyde levels were found in the new furniture.
新家具中检测到高甲醛水平。
Not this
The room smells formaldehyde.
Use this
The room smells of formaldehyde.
动词smell表示“散发…气味”时是不及物动词，不能直接接名词作宾语；要表达“有…的气味”需用smell of + 物质。所以应说smells of formaldehyde。注意与及物用法smell sth（闻到某物）相区别。
Not this
Formaldehyde harms to the human body.
Use this
Formaldehyde harms the human body.
动词harm是及物动词，直接接宾语，中间不能加介词to；这是受harmful to搭配影响而产生的错误。应说harm the body，而不是harm to the body。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
甲醛溶液
The lab stores the formaldehyde solution in a sealed bottle.
实验室将甲醛溶液存放在密封瓶中。
甲醛树脂
Formaldehyde resin is widely used in making adhesives.
甲醛树脂广泛用于制造粘合剂。
甲醛接触；甲醛暴露
Prolonged formaldehyde exposure can cause health problems.
长期接触甲醛可能导致健康问题。
甲醛烟雾
The new furniture gave off formaldehyde fumes for weeks.
新家具数周内都散发出甲醛烟雾。
不含甲醛的
We chose formaldehyde-free paint for the nursery.
我们为婴儿房选择了不含甲醛的涂料。
甲醛排放
The building materials were tested for formaldehyde emissions.
这些建材经过了甲醛排放检测。
我太领先于时代了，几乎都把甲醛用完了。
From Eminem's 2013 song 'Rap God.' The line plays on 'ahead of my time' and the sound-alike 'a head,' joking about a head preserved in formaldehyde, a colorless gas used in preservatives.
出自埃米纳姆2013年的歌曲《Rap God》。这句歌词玩谐音梗：ahead 听上去像 a head，暗指自己像一颗泡在甲醛里的脑袋；甲醛是无色气体，常用来做防腐保存。
Use formaldehyde naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
甲醛(formaldehyde)可拆成 form+aldehyde，联想防腐保存'形态'的刺鼻液体，甲醛即福尔马林主成分。
语域：neutral 常见场景：laboratory analysis、industrial safety notices、consumer product warnings 通常用于科技、医学或工业类文本，正式程度偏中性；日常口语中较少单独使用，更多见于报告、说明或新闻中。
甲醛
Dictionary facts from ECDICT, WIKTIONARY.