每一次运镜都应回答一个问题：展示新信息、跟随人物，还是改变情绪。开始和结束都留出稳定段，速度曲线保持连续；没有叙事动机时，固定机位通常比无意义的移动更有力量。 Motivate every camera move with a purpose: reveal information, follow a subject, or change emotion. Leave a stable handle at both ends and keep the speed curve continuous. A locked-off shot is often stronger than movement without intent.