corona

• 多义词：太阳大气的最外层，日全食时可见；某些花冠的杯状部分；电晕放电；发光物体周围的光环；冠状的解剖结构；或一种长雪茄。

A noun with multiple meanings: the outermost part of the sun's atmosphere visible during a solar eclipse; a cup-shaped part of certain flowers; an electrical discharge; a circle of light around a luminous object; a crown-like anatomical structure; or a type of long cigar.

1. Solar coronaB2formalscientific

   The outermost region of the sun's atmosphere, visible as a white halo during a total solar eclipse.

   日冕

   • The solar corona is only visible during a total eclipse.
   • Scientists study the corona to understand solar activity.
   • The temperature of the corona is much higher than the sun's surface.

2. Botanical coronaC1formalscientific

   A trumpet-shaped or cup-shaped outgrowth of the corolla in certain flowers, such as daffodils or narcissi.

   副花冠

   • The daffodil's corona is a distinctive yellow cup.
   • Narcissus flowers have a prominent corona in the center.
   • The corona of this species is particularly large and frilled.

   同义词crowncuptrumpet

3. Electrical coronaC1formalscientific

   An electrical discharge that occurs when a conductor is surrounded by ionized air, often seen as a faint glow.

   电晕

   • High-voltage power lines can produce a corona discharge.
   • The corona effect is often visible as a blue glow around wires.
   • Engineers design insulators to minimize corona losses.

   同义词corona discharge

4. Optical coronaC1formalscientific

   One or more circles of light seen around a luminous object, caused by diffraction or scattering.

   光学日华

   • A corona appeared around the moon on the foggy night.
   • The streetlight had a faint corona in the mist.
   • Coronas are often observed around the sun through thin clouds.

   同义词aureolehalo

5. Anatomical coronaC2formalmedical

   Any structure in the body that resembles a crown in shape, such as the corona of the glans penis.

   冠状结构（解剖学）

   • The corona of the glans is a sensitive anatomical region.
   • Dentists refer to the crown of a tooth as the corona.
   • The coronary arteries supply blood to the heart's corona.

   同义词crown

6. Cigar typeC1formal

   A long cigar with blunt ends, typically of high quality.

   科罗娜雪茄

   • He lit a corona after dinner.
   • The cigar shop had a selection of coronas from Cuba.
   • A corona is known for its balanced flavor and smooth draw.