switch

• 表示用于接通或断开电路的装置，或表示从一种事物到另一种事物的转变。

A noun referring to a device for making and breaking the connection in an electric circuit, or a change from one thing to another.

1. Device for turning on/offA1formal

   A small device that controls the flow of electricity to a light, appliance, or machine.

   开关

   • Please turn off the light switch before leaving.
   • The switch on the wall controls the ceiling fan.
   • He flipped the switch to start the engine.

   同义词buttoncontrolpush buttontoggle

2. Change or exchangeB1formal

   An act of changing from one thing to another, or a substitution.

   转换

   • We made a switch from gas to electric heating.
   • The team decided on a switch in strategy.
   • A switch in suppliers saved the company money.

   同义词changeexchangereversalshiftsubstitutionswap

3. Railroad track deviceB2formal

   A device used to move a train from one track to another.

   道岔

   • The conductor pulled the lever to operate the switch.
   • The train derailed due to a faulty switch.
   • Switches are essential for directing trains on the railway.

   同义词turnout

• 表示从一种事物转换到另一种事物的动作，或表示开启或关闭某物。

A verb used to indicate the act of changing from one thing to another, or to turn something on or off.

1. Change or exchangeA2formal

   To change from one thing to another, or to exchange something for something else.

   更换

   • She switched her major from biology to chemistry.
   • Can we switch seats? I want to sit by the window.
   • He switched his phone for a newer model.

   同义词changeconvertexchangereplaceshiftsubstituteswaptrade

2. Turn on or offA1formal

   To operate a switch to start or stop the flow of electricity or power.

   开关（电源）

   • Please switch off the lights when you leave.
   • He switched on the television to watch the news.
   • The machine switches off automatically after use.

   同义词flickfliptoggle

   反义词continuekeepmaintainpreserve

3. Change direction or focusB1informal

   To change one's attention, focus, or direction.

   切换

   • The conversation suddenly switched to politics.
   • She switched her focus from work to her hobbies.
   • The driver switched lanes without signaling.

   同义词alterchangeredirectreorientshiftswingturnveer

   反义词continuepersistremainstay

短语动词变体switch offswitch onswitch over