1
an impurity in sth
impurity 作可数名词时指“一种杂质”；介词 in 后接被污染的物质。
Scientists found an impurity in the sample.
科学家在样本中发现了一种杂质。
杂质
impurities — plural of impurity
先理解核心含义，再看它在真实句子里的用法。
杂质
worthless or dangerous material that should be removed
Scientists found an impurity in the sample.
科学家在样本中发现了一种杂质。
指物质中的杂质，不指“不纯”的状态。
不纯的状态；因污染、掺假或净化不足所致。
The condition of being impure; because of contamination, pollution, adulteration or insufficient purification.
应去除的无用或有害杂质
worthless or dangerous material that should be removed
使其他物质不纯的成分或添加剂。
A component or additive that renders something else impure.
不纯；掺杂的状态
the condition of being impure
The water filter removes harmful impurities from the drinking water.
净水器能去除饮用水中的有害杂质。
AI contextual example
Scientists test the gold for impurities before it is sold.
科学家在黄金出售前会检测其中的杂质。
AI contextual example
A tiny impurity in the metal can weaken the entire structure.
金属中微小的杂质会削弱整个结构。
AI contextual example
there were impurities in the water
水中有杂质
WordNet
impurity 作可数名词时指“一种杂质”；介词 in 后接被污染的物质。
Scientists found an impurity in the sample.
科学家在样本中发现了一种杂质。
impurities 常用复数，与 remove、filter、separate 等动词搭配。
This filter removes impurities from the water.
这种过滤器能去除水中的杂质。
free from 为固定搭配，后接不需要的物质，表示“不含、没有”。
The product is free from impurities.
这种产品不含杂质。
Not this
There are many impurity in the water.
Use this
There are many impurities in the water.
impurity 在这里是可数名词，表示“杂质”；many 后接可数名词复数，因此要用复数形式 impurities。
Not this
The impurities is harmful to health.
Use this
The impurities are harmful to health.
主语 impurities 是复数，谓语动词要用复数 are，不能用单数 is；这是主谓一致问题。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
去除杂质
Water filters remove impurities from drinking water.
滤水器去除饮用水中的杂质。
过滤掉杂质
The system filters out impurities in the air.
该系统过滤掉空气中的杂质。
含有杂质
This sample contains impurities that affect the results.
这个样本含有影响结果的杂质。
微量杂质
Even trace impurities can weaken the material.
即使是微量杂质也会削弱这种材料。
有害杂质
The process removes harmful impurities from the oil.
该过程去除油中的有害杂质。
化学杂质
Chemical impurities can change the color of the crystal.
化学杂质可以改变晶体的颜色。
Use impurities naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
联想：im（不）+pure（纯净）+ity（性质），纯净水里掉进泥沙，就是 impurity（杂质、不洁）。
语域：neutral 常见场景：chemistry and materials、quality inspection、general description of substances impurity 表示“应去除的杂质、不纯物”时通常为中性词，多用于化学、材料或质检等说明性语境，也较常见于一般性描述。日常口语中较少用到，但也不算生硬。
purity、security、obscurity、maturity 与 impurity 押韵，重音后均为 /ʊrəti/；impunity 拼写相似但读音不同，注意区分。
Dictionary facts from ECDICT, WIKTIONARY.