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TOEFL IELTS BNC: 1952 COCA: 2604
switchnounuk/swɪtʃ/ us/swɪtʃ/

switch noun DEVICE

B1 [ C ] a small device, usually pushed up or down with your finger, that controls and turns on or off an electric current开关

a light switch电灯开关
Can you flip the switch?你能打开那个开关吗？
switches [ plural ] US mainly UK points

a place on a railway track where the rails (= metal bars on which the trains travel) can be moved to allow a train to change from one track to another（铁路的）道岔，转辙器

The train rattled as it went over the switches.火车哐啷哐啷驶过道岔。

More examples

You turn the television on by flipping the switch at the side.

Mysteriously, the light came on, although no one was near the switch.

An additional power switch for the radio is handily located next to the steering wheel.

She flicked the on-off switch.

All these machines operate at the flick of a switch.

switch noun CHANGE

[ C ] a sudden or complete change, especially of one person or thing for another突然改变，彻底改变；调换；转换

switchverb [ T, I usually + adv/prep ]uk/swɪtʃ/ us/swɪtʃ/

switch verb [ T I usually + adv/prep ] DEVICE

B1 to use a switch to change a device from one state or type of operation to another打开（开关）；关闭（开关）；转换

switch the TV off/on关／开电视

More examples

Are you positive that you saw me switch the iron off?

By toggling this key, you can switch the italics on and off.

Could you switch on the radio?

She switched to another channel to watch the football.

The computer takes a few seconds to power up after it's been switched on.

switch verb [ T I usually + adv/prep ] CHANGE

B2 to change suddenly or completely, especially from one thing to another, or to exchange by replacing one person or thing with another突然改变，彻底改变；调换；转换

She started studying English, but switched to Law in her second year.她刚上大学时学的是英语，但二年级的时候她改学法律了。
In 1971, Britain switched over (= changed completely) to a decimal currency.1971年，英国改用十进制货币。
After the bank robbery, the gang switched cars (= left one car and got into another).抢劫银行后，匪徒们换了汽车。

More examples

The robbers switched the painting for a fake.

We used to have oil-fired central heating, but now we've switched to gas.

Many European countries have now switched over to the Euro.

He's decided to switch the meeting from Monday to Thursday.

Will you switch shifts with me on Friday?

Phrasal verb(s)

switch off
switch sth on

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