短语词组短語grazing approach angle 切線進入角grazing incidence angle 掠入射角grazing g angle 入射餘角beam grazing angle 波束掠射角high grazing angle 大入射餘角high -grazing angle 高入射餘角critical grazing angle 臨界掠射角low grazing angle 低入射餘角下 返回 grazing angle