rapid

• 形容事物发生或进行得非常快，速度很高。

Describes something that happens very quickly or at a high speed.

1. Fast or quickA2formal

   Happening in a short time; moving at high speed.

   快速的

   • The patient showed rapid improvement after the treatment.
   • We witnessed a rapid change in the weather.
   • The company experienced rapid growth this year.

   同义词briskexpeditiousfasthastyhigh-speedhurriedquickspeedyswift

   反义词leisurelyslowsluggishunhurried

2. Done quicklyB1formal

   Performed or completed with speed.

   快速的

   • She made a rapid decision to accept the job offer.
   • The rapid response of the fire department saved the building.
   • He took rapid steps to resolve the issue.

   同义词briskfasthastypromptquickspeedyswift

   反义词leisurelyslowsluggishunhurried

• 指河流中水流极快、常常流经岩石或陡坡的河段，即可称为急流的地段。

A noun referring to a section of a river where the water flows very quickly, often over rocks or a steep gradient.

不规则复数

1. Fast-flowing river sectionB1formal

   A part of a river where the water flows very quickly, often over rocks, creating a turbulent surface.

   急流

   • The kayakers navigated the dangerous rapids with skill.
   • We could hear the roar of the rapids from a distance.
   • The river's rapids made swimming impossible.

   同义词cataractchuteriffletorrentwhitewater