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phenol + be + noun phrase
phenol 指苯酚这种具体物质时通常用作不可数名词，不加冠词。
Phenol is a weakly acidic organic compound.
苯酚是一种弱酸性有机化合物。
酚；酚类化合物
先理解核心含义，再看它在真实句子里的用法。
酚；酚类化合物
any of a class of weakly acidic organic compounds whose molecules contain one or more hydroxyl groups
Phenol is a weakly acidic organic compound.
苯酚是一种弱酸性有机化合物。
也常特指苯酚
苯酚
A caustic, poisonous, white crystalline compound, C6H5OH, derived from benzene and used in resins, plastics, and pharmaceuticals and in dilute form as a disinfectant and antiseptic; once called carbolic acid
一类弱酸性有机化合物；分子含有一个或多个羟基
any of a class of weakly acidic organic compounds; molecule contains one or more hydroxyl groups
酚类
Any of a class of aromatic organic compounds having at least one hydroxyl group attached directly to the benzene ring (or other aromatic ring)
一种有毒的白色可溶性结晶酸性苯衍生物；用于制造业及作为消毒剂和防腐剂；内服有毒
a toxic white soluble crystalline acidic derivative of benzene; used in manufacturing and as a disinfectant and antiseptic; poisonous if taken internally
In chemistry class, we learned that phenol is used to make plastics and resins.
在化学课上，我们学到苯酚用于制造塑料和树脂。
Some phenols occur naturally in plants and help protect them from insects.
一些酚类化合物天然存在于植物中，帮助植物抵御昆虫。
The lab technician handled the phenol carefully because it can irritate the skin.
实验室技术员小心地处理苯酚，因为它可能刺激皮肤。
phenol 指苯酚这种具体物质时通常用作不可数名词，不加冠词。
Phenol is a weakly acidic organic compound.
苯酚是一种弱酸性有机化合物。
a phenol 是可数用法，表示酚类化合物中的某一个具体种类。
A phenol contains one or more hydroxyl groups.
一种酚含有一个或多个羟基。
phenols 是复数形式，泛指酚类化合物这一类物质。
Phenols are a class of weakly acidic organic compounds.
酚类是一类弱酸性有机化合物。
Not this
Phenol is a class of organic compounds containing hydroxyl groups.
Use this
Phenols are a class of organic compounds containing hydroxyl groups.
表示“酚类”这一类别时，英文要用复数 phenols 作主语，系动词用 are；单数 phenol 专指苯酚（C6H5OH），不能指整个类别。
Not this
Phenol compounds are found in many plants.
Use this
Phenolic compounds are found in many plants.
英语中“酚类化合物”是固定术语 phenolic compounds，需用形容词 phenolic 修饰 compounds；phenol 是名词，phenol compounds 不符合化学英语的规范搭配。
Not this
The reaction introduces a phenol group into the molecule.
Use this
The reaction introduces a phenyl group into the molecule.
苯基（C6H5-）的英文是 phenyl（形容词/名词），而 phenol 是“苯酚”整个化合物；说“引入苯基”要用 phenyl group，不能用 phenol group。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
酚醛树脂
Phenol formaldehyde resin is widely used in adhesives and molded products.
酚醛树脂广泛用于粘合剂和模压制品。
酚红（pH指示剂）
Add a drop of phenol red to the culture medium to detect pH changes.
向培养基中滴加一滴酚红以检测pH变化。
酚系数（消毒剂效力指标）
The phenol coefficient compares a disinfectant's germicidal power with that of phenol.
酚系数将消毒剂的杀菌效力与苯酚进行比较。
稀苯酚溶液
A dilute phenol solution can be used as a mild antiseptic.
稀苯酚溶液可用作温和的防腐剂。
酚羟基
The phenol hydroxyl group makes the compound weakly acidic.
酚羟基使该化合物呈弱酸性。
Use phenol naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
phenol 开头的 phe 近似‘酚’的拼音 fen，词尾 -ol 常见于酚/醇类，记住它含羟基 -OH。
语域：formal 常见场景：化学、医药、工业 苯酚属于化学等专业领域的术语，多用于学术、医疗或工业技术场合，日常口语中比较少见。
指苯酚这种化学物质时通常不可数；指酚类化合物中的一种时可用复数 phenols。
Dictionary facts from ECDICT, WIKTIONARY.