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positive/negative ion
离子可带正电或负电。
A positive ion is called a cation.
正离子被称为阳离子。
离子
先理解核心含义，再看它在真实句子里的用法。
离子
an atom or group of atoms that has an electric charge because it has lost or gained electrons
A positive ion is called a cation.
正离子被称为阳离子。
带电荷的原子或原子团,如盐溶液中的钠原子和氯原子
An atom or group of atoms bearing an electrical charge, such as the sodium and chlorine atoms in a salt solution.
带电的粒子(正或负)；失去或得到一个或多个电子的原子、分子或基团
a particle that is electrically charged (positive or negative); an atom or molecule or group that has lost or gained one or more electrons
When salt dissolves in water, it breaks into positive and negative ions.
盐溶于水时，会分解成正离子和负离子。
The battery works by moving ions from one electrode to the other.
电池通过将离子从一个电极移动到另一个电极来工作。
Each ion in the solution carries either a positive or a negative charge.
溶液中的每个离子都带有正电荷或负电荷。
离子可带正电或负电。
A positive ion is called a cation.
正离子被称为阳离子。
常见于化学处理过程。
Water softeners use ion exchange to remove minerals.
软水器利用离子交换去除矿物质。
A sodium ion is formed from a sodium atom by losing an electron.
钠离子通过失去一个电子由钠原子形成。
Not this
negative iron
Use this
negative ion
易混淆：'ion'（离子）和'iron'（铁）拼写和发音相近，但含义不同。
Not this
There are many ion in the solution.
Use this
There are many ions in the solution.
'ion'是可数名词，表示多个离子时需用复数形式'ions'。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
正离子
Positive ions are attracted to the negative electrode.
正离子被吸引到负极。
负离子
Negative ions can improve air quality.
负离子可以改善空气质量。
离子通道
Ion channels play a key role in nerve signal transmission.
离子通道在神经信号传递中起关键作用。
离子交换
Ion exchange is used to soften hard water.
离子交换用于软化硬水。
离子束
The ion beam is used for precise material etching.
离子束用于精确的材料蚀刻。
离子注入
Ion implantation is a common technique in semiconductor fabrication.
离子注入是半导体制造中的常用技术。
Use ion naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
音似爱嗯，想象一个带电原子开着电。
register: formal; contexts: chemistry, physics, biology; note_zh: 离子是科学术语，多用于化学、物理等科学领域。
复数形式直接加 -s：ions。
Dictionary facts from ECDICT, WIKTIONARY.