短语词组短语focusing storage ring 弱聚焦存储环weak -focusing storage ring 弱聚焦存储环eyepiece focusing ring 目镜调焦环;目镜self -focusing ring 自聚焦环focusing ring for fiberscope 纤维光束内窥镜用调焦轮ring focusing 环型聚焦 返回 focusing ring