推拉或轨道移动会改变前景、中景和背景的相对速度，产生视差和空间感。让前景承担可感知的运动，背景保持层次；移动距离应服务于情绪变化，而不只是模拟变焦。 Dolly moves change the relative speed of foreground, midground, and background, creating parallax and depth. Give the foreground something to reveal and use the travel distance to express an emotional change rather than imitating a zoom.