half width beam angle

half width beam angle vertical beam width in degrees什么 意思 英语翻译是2倍还是1/2?原句是：is to reduce the beam width in the azimuth plane by a factor of 2 beam led beam angle Beam me main beam, beam是什么意思? beam dwell “beam-iduced” 相对论 一架宇宙飞船以一半的光速飞行a spaceship moves at half the speed of light and shines one laser beam forward and another beam backward.As seen by an observer at rest,does the beam shining forward move faster than the one shining Chest width @ half Half half beam me up中文歌词 Beam homogenizer翻译, bundle beam 是什么区别