circulation

• 指血液通过心脏和血管的持续流动，也指空气、液体或其他物质在系统中的流动；还可指信息、货币等的流通或传播。

A noun referring to the continuous movement of blood through the heart and blood vessels, or the movement of air, fluids, or other substances through a system.

不可数

1. Blood flowB2formalmedical

   The movement of blood through the heart and blood vessels in the body.

   血液循环

   • Regular exercise improves blood circulation.
   • Poor circulation can cause numbness in the hands and feet.
   • The doctor checked his circulation by feeling his pulse.

   同义词bloodstreamperfusion

2. Distribution of informationB1formal

   The process of distributing newspapers, magazines, or other publications to readers.

   发行

   • The newspaper has a daily circulation of over 500,000 copies.
   • The magazine's circulation has increased this year.
   • They are expanding the circulation of their newsletter.

   同义词disseminationdistributionissuancepublicationspread

3. Movement or flowB2formal

   The continuous movement of something through a system or area.

   循环

   • The circulation of air in the room is poor.
   • Money circulation is essential for a healthy economy.
   • The library tracks the circulation of its books.

   同义词coursecurrentflowmotionmovementpassagetraffic