分镜不只画构图，还要标记镜头目的、运动方向、对白和转场条件。把分镜按剪辑顺序排成表格，拍摄现场能快速判断哪些镜头是必需覆盖，减少无效素材。 A storyboard should record shot purpose, movement direction, dialogue, and transition conditions, not only composition. Arrange it in edit order so the set knows which coverage is essential and which shots are optional.