先让人物走完路线，再决定机位和焦距。人物停留点、视线和交接动作确定后，摄影机才能找到既不挡表演又能保持构图的路径。 Walk the actors through the route before locking the camera. Once marks, eyelines, and handoffs are known, the camera can find a path that protects both performance and composition.