1
a transformer changes [voltage] from [A] to [B]
意思为“变压器把电压从……变为……”。当主语是 transformer 时，常用这个主动结构。
A transformer changes the voltage from 220 volts to 110 volts.
变压器把电压从220伏变为110伏。
变压器
先理解核心含义，再看它在真实句子里的用法。
变压器
a device that changes the voltage of an alternating current
A transformer changes the voltage from 220 volts to 110 volts.
变压器把电压从220伏变为110伏。
改变自身或他物形状的事物。
Something that transforms, changing its own or another thing's shape.
变形金刚系列中的一种玩具,其机械部件使其能从人形机器人形态改变为另一种形态,通常是车辆。
A toy in the Transformers toyline which has mechanical parts that allow it to be altered in appearance from its original form as a humanoid robot action figure to another form, usually a vehicle, depending on the toy.
一种电气设备,用于将一种电压的交流电变为另一种电压
an electrical device by which alternating current of one voltage is changed to another voltage
通过磁耦合将电能从一个电路传递到另一个电路的静态装置,主要用于不同电压等级间的能量传递。
A static device that transfers electric energy from one circuit to another by magnetic coupling; primarily used to transfer energy between different voltage levels, which allows the most appropriate voltages for power generation, transmission and distribution to be chosen separately.
The electrician replaced the faulty transformer at the substation.
电工更换了变电站里出故障的变压器。
A transformer converts high-voltage electricity into a lower voltage for homes.
变压器把高压电转换成适合家庭使用的较低电压。
When the transformer overheated, the whole street lost power.
变压器过热时，整条街都断电了。
意思为“变压器把电压从……变为……”。当主语是 transformer 时，常用这个主动结构。
A transformer changes the voltage from 220 volts to 110 volts.
变压器把电压从220伏变为110伏。
被动结构强调电压的改变由变压器完成，by 后面接 transformer。
The voltage is changed from 220 volts to 110 volts by the transformer.
电压由变压器从220伏变为110伏。
Not this
This device can transformer alternating current into direct current.
Use this
This device can transform alternating current into direct current.
transformer 是名词，意为“变压器”；表示“转变、变换”的动词是 transform。该句谓语位置需要动词，不能把名词 transformer 当动词使用，因此应改为 transform。
Not this
The transformer of the city surprised everyone.
Use this
The transformation of the city surprised everyone.
transformer 的名词义指“变压器”这种设备，不表示“变化”这一过程。要表达“城市的变迁、转变”应使用名词 transformation，所以这里不能用 transformer。
Not this
There are many transformer in the power plant.
Use this
There are many transformers in the power plant.
transformer 是可数名词，复数形式为 transformers。汉语名词没有复数变化，学习者容易漏掉词尾 -s；在 there are 后必须用复数形式 transformers。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
升压变压器
A step-up transformer raises the voltage for transmission.
升压变压器提高电压以便输电。
降压变压器
The step-down transformer lowers the voltage for household use.
降压变压器降低电压以供家庭使用。
电力变压器
Power transformers are used in substations to distribute electricity.
电力变压器用于变电站配电。
配电变压器
A distribution transformer provides power to local homes and businesses.
配电变压器为当地家庭和企业供电。
隔离变压器
An isolation transformer protects sensitive equipment from electrical noise.
隔离变压器保护敏感设备免受电气噪声干扰。
变压器油
Transformer oil helps cool the transformer and insulate its windings.
变压器油有助于冷却变压器并绝缘其绕组。
出自1984年首播的美国动画《变形金刚》主题曲，后来成为该系列电影的经典口号，意思是“变形金刚，绝非表面看起来那么简单”。
When the car suddenly transformed into a robot, he laughed and said, 'Transformers, more than meets the eye.'
当那辆车突然变成机器人时，他笑着说：“变形金刚，超乎所见。”
同样出自《变形金刚》动画片主题曲，描述变形金刚隐藏身份、伪装成汽车等物体，是粉丝熟知的经典歌词。
As the toy truck folded into a fighting robot, the kid shouted, 'Transformers, robots in disguise!'
当玩具卡车折叠成战斗机器人时，孩子喊道：“变形金刚，伪装的机器人！”
Use transformer naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
联想：transform 是“转变”，-er 是“东西”；变压器就是把电压“转变”的电器。
语域：neutral 常见场景：电气工程、电力设备、家电维修 作“变压器”讲时为中性常用词，多用于电气工程、电力设备或日常电器讨论中，口语和书面语都较常见，通常指改变电压的电气设备。
这些词与 transformer 的重读音节 /fɔrmɚ/ 押韵：former、performer、reformer、informer 和 warmer（warmer 拼作 -armer，但读音相同）。注意形似的 isomer /ˈaɪsəmər/ 和 consumer /kənˈsuːmər/ 拼写相近，但发音不同。
Dictionary facts from ECDICT, WIKTIONARY.