以太,能媒一种在以前被假定为电磁波的传播媒质并具有''.'绝对'.''连续性 、 ''.'高度'. ''弹性的极其稀薄的媒体.An all - pervading , infinitely elastic, massless medium formerly postulated as the medium of pro...
The undulating planes of the countryside provide relief from the hard horizontals and verticals of the urban scene.乡村起伏不平的地势使人们摆脱了城市刻板的横平竖直景象。Monorail vehicles and ships use gyro verticals for stabilization.独轨车辆及船舶上使用陀螺垂...