短语词组短語parabolic c mirror 拋物麪鏡parabolic mirror control 拋物柱麪鏡控制axis parabolic mirror 離軸拋物麪反射鏡rigid parabolic mirror 剛性拋物麪反射鏡off -axis s parabolic mirror 離軸拋物麪反射鏡 返回 parabolic mirror