1、半环
... half revolution 半转 half ring 半环 half round reamer 半圆铰刀 ...
2、对开圆环
... lever 手柄 half ring 对开圆环 plug 活塞 ...
articulating half-ring[古生] 关节半环
half-ring半环
rear half baffle ring后凸圆盘
half elliptic ring半椭圆形弹簧
half-ring gear半齿圈
half-ring fixator半环槽式外固定器
half cloud ring半云环