hoop基本解释
n,[建]箍；铁环；呼呼声,同近
A boy came towards them, rolling an iron hoop..一个男孩滚着一个铁环朝他们走来。
箍；铁环；呼呼声英释中释na large ring made of wood, metal, plastic etc
hoop stress,环向应力；箍应力；环形电压.短语
