循环回路的英文：
circulation loop
n. 血液循环；流通，传播；发行量
- 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。
n. 环，圈；回路；弯曲部分；翻筋斗
v. 打环；以环连结；（使）翻筋斗
- 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。