flat

• 形容表面平坦光滑，没有隆起或高低不平；也可指水平的、平直的，或平淡无味的。

Describes a surface that is level and smooth, without raised areas or bumps.

1. Level and smoothA1formal

   Having a level and even surface without curves or bumps.

   平坦的

   • The table has a flat surface.
   • We need a flat piece of wood for the project.
   • The road is completely flat for miles.

   同义词evenflushhorizontallevelplanarplanesmoothuniform

   反义词bumpyirregularlumpyroughuneven

2. Boring or dullB1informal

   Lacking interest, excitement, or variety.

   乏味的

   • The movie was flat and predictable.
   • His speech fell flat with the audience.
   • The party was a bit flat without music.

   同义词boringdrearydullinsipidlacklustermonotonousstaletediousuninterestingvapid

   反义词animatedcaptivatingcolorfuldynamicengagingentertainingeventfulexcitingfascinatinginterestinglivelyspiritedstimulatingthrillingvivid

3. DeflatedA2informal

   Containing no air or gas; not inflated.

   瘪的

   • The car tire is flat.
   • She had to pump up the flat ball.
   • The balloon went flat after a few hours.

   同义词deflatedpunctured

   反义词blownfilledinflatedpumped

4. Fixed or absoluteB2formal

   Used to describe a fixed price or a definite refusal.

   固定的或绝对的

   • They offered a flat rate for the service.
   • He gave a flat 'no' to the proposal.
   • The price is flat, with no hidden fees.

   同义词absolutecategoricaldefinitefirmfixedoutrightperemptoryunconditionalunequivocalunqualified

   反义词flexiblenegotiablevariable

• 副词，表示“完全地”“彻底地”“断然地”或“直截了当地”。常用于加强语气，如“flat broke”（身无分文）、“flat out”（全力以赴）；也可表示“恰好”“正好”。

An adverb meaning 'completely,' 'exactly,' or 'in a direct manner.' It is often used for emphasis, as in 'flat broke' or 'flat out.' The form is identical to the adjective and does not take the -ly ending.

1. In a horizontal or level positionA2formal

   Lying or placed in a straight, level position, without any slope or curve.

   平放

   • He lay flat on the floor after the long run.
   • The map was spread flat across the table.
   • She fell flat on her face in the snow.

   同义词horizontally

2. Completely or absolutelyB1informal

   Used to emphasize a negative statement or to mean 'completely' or 'absolutely'.

   完全地

   • He turned down the offer flat.
   • She told him flat out that she wasn't interested.
   • The proposal was rejected flat by the committee.

   同义词absolutelycategoricallycompletelyentirelyoutrightplainlypositivelysimplytotallyutterly

3. Exactly or preciselyB2informal

   Used to indicate an exact amount of time, often in a short period.

   正好

   • He finished the race in ten seconds flat.
   • She arrived in five minutes flat.
   • The repair was done in two hours flat.

   同义词deadexactlyjustpreciselyright

• 名词，指一套供人居住的房间，通常位于建筑物的一层。

A noun referring to a self-contained set of rooms for living in, typically on one floor of a building.

1. ApartmentA1formalbritish

   A set of rooms for living in, usually on one floor of a building.

   公寓

   • She lives in a small flat in London.
   • They bought a new flat near the city center.
   • The flat has two bedrooms and a kitchen.

   同义词apartmentcondominiumsuiteunit

2. Level surfaceB1formal

   A flat area of land, especially a low-lying area.

   平地

   • The farmer planted crops on the river flat.
   • They camped on a grassy flat near the lake.
   • The house is built on a flat overlooking the valley.

   同义词expanselevellowlandplain

3. PunctureA2informal

   A flat tire on a vehicle.

   瘪胎

   • I got a flat on the way to work this morning.
   • He had to change the flat tire by the roadside.
   • The car pulled over because of a flat.

   同义词blowoutflat tirepuncture

4. B2formal

   A musical note that is one semitone lower than the natural note.

   降音

   • The piece is written in the key of B flat.
   • She played a C flat on the piano.
   • The conductor asked for a flat note in the second movement.