Grammar Note
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。
酚；酚类化合物
phenols — plural of phenol
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
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。
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
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。
Choose the next layer that will help you use phenols with more confidence.
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Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
Use phenols naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
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。
页面下方列出了常见词形变化。学习时注意它们在句子中的语法位置。
Dictionary facts from ECDICT, WIKTIONARY.