循环回路的英文：
circulation loop

• Have you been circulated with details of the conference?
  你收到会议详情的通知了吗？
• circulate counterfeit coins
  使伪造的钱币流通
• This magazine has a large circulation.
  这本杂志发行量很大。
• The circulation of gossip is abhorrent.
  传播流言蜚语是可恶的。
• The air was circulated mechanically.
  空气循环是靠机械驱动的。

• The airman looped the loop eight times.
  那位飞行员作了八次翻筋斗的飞行表演。
• The plane looped the loop three times.
  飞机连翻了三个跟头。
• Loop the tree with a rope = loop a rope around the tree
  将绳子卷绕于树
• Loop the curtains up.
  把窗帘卷起来。
• They looped the thing together.
  他们用环将那些东西系在一起。