loop基本解释
vi,打环；[航]翻筋斗,同近
He looped the rope over the wood..他把绳子打了环系在木头上。
打环；翻筋斗英释vvto fly a plane up and around in a circle so that the plane is upside down for a time
closed loop,闭环，闭合环路.短语
