?竖直摆
... 直线 1.(不弯曲的线) straight line2.(急剧的) steep; sharp 生产直线上升 sharp rise in production; 直线尺 straightedge rule; 直线传播 rectilinear propagation; 直线飞行 rectilinear flight; 直线距离 air line distance; crow-fly distance; straight-line distance; 直线球 straight shot; 直线运动 [力学] linear motion; rectilinear motion; rectilinear movement; straight-line motion 竖直摆 vertical pendulum 竖直板 vertical plate ...