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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
TOEFL IELTS BNC: 1952 COCA: 2604
switch

noun¹

 1small button/lever小按鈕；小控制桿ADJECTIVE | VERB + SWITCH | SWITCH + VERB | PREPOSITION | PHRASES ADJECTIVE➤master, power總開關；電源開關◇The master switch is under the stairs.總開關在樓梯下。➤electric, electrical電開關；電氣開關▸➤off, on, on-off停機／開機／轉換開關◇I couldn't find the off switch on the remote control.我找不到遙控器上的關機按鈕。➤dimmer, timer, toggle (especially NAmE) 調光／定時／切換開關◇We fitted dimmer switches in all the bedrooms.我們在所有的卧室裏都安裝了調光器。➤ignition, light, wall (NAmE) 點火／電燈／牆上開關VERB + SWITCH➤flick, flip, hit, press, pull, throw, turn off, turn on輕按開關；按動開關；拉電閘；扳電閘；關上開關；打開開關◇Someone threw a switch and the electricity went off.有人扳了電閘，電就斷了。SWITCH + VERB➤activate sth, control sth, operate sth開關啟動⋯／控制⋯／操作⋯◇This switch controls the heating system.這個開關控制供熱系統。PREPOSITION➤by a switch用開關◇The light operates by a timer switch.這個燈由定時開關控制。➤on a switch連在開關上◇The heater is on a timer switch.加熱器連在一個定時開關上。➤switch for⋯的開關◇the switch for the air conditioning空調的開關PHRASES➤at the flick of a switch輕輕按一下開關◇in the days before electricity was available at the flick of a switch在還不能一按開關就有電用的日子
switch

noun²

 2change that sb makes改變ADJECTIVE | VERB + SWITCH | PREPOSITION ADJECTIVE➤abrupt, sudden突然的轉變▸➤big大轉變▸➤complete完全的轉變▸➤tactical (especially BrE) 戰術的改變◇The team's manager made a shrewd tactical switch.該隊主教練對戰術作出了高明的調整。VERB + SWITCH➤make作出改變PREPOSITION➤switch away from, switch from改變⋯◇There will be no overnight switch away from old voting habits.不會一夜之間就改變舊的選舉習慣。◇her switch from full-time to part-time work她從全職到兼職的轉變➤switch back to, switch over to, switch to變回；變向◇He's a classical singer who has made the switch over to pop.他是古典歌手，已改唱流行歌曲。➤switch between在⋯之間轉換◇the recent switches between direct and indirect taxation近期在直接稅和間接稅之間的反複➤switch in⋯的轉變◇their abrupt switch in allegiance他們在擁戴對象方面的突然轉變
switch

verb

ADVERB | VERB + SWITCH | PREPOSITION ADVERB➤easily, readily, simply容易地／輕易地／輕鬆地轉換▸➤suddenly突然轉變◇My mind suddenly switched back to my conversation with Jeremy.我的思緒突然回到了與傑里米的談話上。➤quickly快速轉換➤automatically自動轉換▸➤around, back, back and forth, over, round (especially BrE) 改變位置；換回來；來回轉換VERB + SWITCH➤decide to決定轉變◇He decided to switch tactics.他決定改變策略。PREPOSITION➤between在⋯之間轉換◇The remote control allows you to switch easily between TV channels.遙控器可以使你在不同電視頻道之間輕鬆轉換。➤away from, from轉離◇He switched his allegiance from the British to the French.他不再效忠英國，轉而效忠法國。➤to換成➤with與⋯交換◇We asked them if they would switch places with us.我們問她們是否願意和我們對換座位。
TOEFL IELTS BNC: 1952 COCA: 2604
switch noun
⇨ button 1 (a light switch) ⇨ change 2 (a policy switch)switch verb
⇨ replace 2 (switch my glass with hers) ⇨ switch (switch over to a new system) switch

verb

switch ♦︎ change (sth) over ♦︎ convert ♦︎ swapThese words all mean to change or make sth change from one thing to another. 这些词均表示改变、转变。PATTERNS AND COLLOCATIONS 句型和搭配◆to switch over / change over / convert from sth to sth◆to switch / change / swap over◆to switch / convert / swap easily■ switch [intransitive, transitive] (rather informal) to change or make sth change from one thing to another 改变；转变◆Press these two keys to switch between documents on screen.按这两个键，可以切换屏幕上的文件。◆The meeting has been switched to next week.会议改到下周举行。◆When did you switch jobs?你什么时候换了工作？  see also switch ⇨ change noun 2 ■ ˌchange ˈover■ ˌchange sth ˈover

phrasal verb

to change or make sth change from one system or position to another 改变（系统或位置）◆The farm has changed over to organic methods.农场已改用有机作业。◆We've changed the farm over to organic production.我们已经将农场改变为有机化生产。   see also change ⇨ change noun 2 NOTE 辨析 Switch or change over? Switch is more informal than change over and is often used in journalism. Change over is more often used with to than from. * switch不如change over正式，常用于新闻中。change over更常与to而非from连用◆to change over to nicotine gum / dairy farming / a nuclear policy改用尼古丁口香糖；改为养乳牛；转变为核政策 Switch is often used to talk about moving between two opposite positions, or from an old-fashioned system to a new one. * switch常指在两个相反的位置之间移动，或从旧系统向新系统转换◆to switch over from recovery to relapse从康复转变为旧病复发◆to switch over to a metric standard / electronic mail改用公制标准／电子邮件 ■ convert kənˈvɜːt; NAmE kənˈvɜːrt [intransitive] (rather formal) to change a habit or opinion 改变（习惯或观点）◆I've converted to organic food.我改吃有机食物了。   see also conversion ⇨ change noun 2 ■ swap ( swop) swɒp; NAmE swɑːp(-pp-) [intransitive] to start doing sb else's job, etc. while they do yours 交换（工作）◆I'll drive there and then we'll swap over on the way back.去的时候我开车，回来时咱俩再倒换过来。   see also swap ⇨ exchange noun
TOEFL IELTS BNC: 1952 COCA: 2604
switch
To change something: change, make into, convert...
To become different: change, turn into, change into...
To replace, or to be replaced: replace, change, renew...
Knobs and switches on machinery and equipment: actuator, console, control...
Changes: effect, change, trend...
Long and thin objects: line, strip, stick...

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