1
alternating current + verb
Alternating current changes direction periodically.
交流电定期改变方向。
交流电
先理解核心含义，再看它在真实句子里的用法。
交流电
an electric current in which the direction of flow reverses periodically
Alternating current changes direction periodically.
交流电定期改变方向。
电子流动方向周期性反转的电流。
An electric current in which the direction of flow of the electrons reverses periodically.
Most household appliances run on alternating current from the power grid.
大多数家用电器依靠电网的交流电运行。
The engineer explained how alternating current changes direction periodically.
工程师解释了交流电如何周期性改变方向。
We need a converter to change direct current into alternating current for this device.
我们需要一个转换器将直流电转换为交流电供这个设备使用。
Alternating current changes direction periodically.
交流电定期改变方向。
This device uses alternating current.
这个设备使用交流电。
缩写AC常用于技术语境。
Alternating current (AC) is the standard for power grids.
交流电（AC）是电网的标准。
Not this
The power grid supplies alternating electricity.
Use this
The power grid supplies alternating current.
在中文里，“交流电”的字面翻译是“alternating electricity”，但英语中标准术语是“alternating current”。学习者容易直接逐字翻译，导致用词错误。
Not this
The alternating current is a form of electricity.
Use this
Alternating current is a form of electricity.
在英语中，不可数抽象名词用于泛指时不加定冠词“the”。中文没有冠词，学习者常受此影响而过度使用“the”。
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Use alternating current naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
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 DICTIONARY_API_DEV, ECDICT, WIKTIONARY.