短语词组短语Ophthalmic rotary prism 眼科旋转棱镜hand held rotary prism 手持旋转棱镜variable rotary prism 变易回旋性棱镜rotary prism lens 旋转棱镜rotary dual -wedge prism 旋转双光楔prism rotary principle 棱镜转动定理 返回 rotary prism