valve

• 指调节液体、气体或其他物质流动的机械或生物结构，也指乐器或贝壳的组成部分。

A noun referring to a mechanical or biological device that regulates the flow of a fluid, gas, or other material, or a part of a musical instrument or shell structure.

1. Anatomical structureB2formalmedical

   A flap-like structure in a hollow organ, such as the heart, that ensures fluid flows in only one direction.

   瓣膜

   • The heart has four valves that control blood flow.
   • A damaged valve can lead to serious health issues.
   • The surgeon repaired the mitral valve during the operation.

2. Mechanical control deviceB1formal

   A mechanical device used to regulate the flow of a fluid, such as liquid or gas, by opening, closing, or partially obstructing passageways.

   阀门

   • The plumber replaced the faulty water valve.
   • Turn the valve clockwise to shut off the gas supply.
   • The engine's intake valve controls the air-fuel mixture.

   同义词cockfaucetgatespigotstopcocktap

3. Musical instrument partB2formal

   A device in brass wind instruments that changes the length of the air column to produce different pitches.

   活塞

   • The trumpet has three valves that the player presses.
   • He learned to use the valves to play different notes.
   • The trombone uses a slide instead of valves.

   同义词pistonrotor

4. Mollusk shell partC1formal

   One of the paired hinged shells of certain mollusks, such as clams and oysters, or the entire one-piece shell of a snail.

   壳瓣

   • The clam has two valves that close tightly.
   • A snail's shell is a single valve.
   • The fossil showed the distinct shape of a bivalve.