产品/人物介绍样本把推近和向下摇组合，用来从讲解者转到被展示对象。复现时先单独测试两个动作，再决定组合速度，避免同时改变方向和焦距导致主体出框。 A product or presenter sample combines a zoom-in and tilt-down to move from the explainer to the object. Test both moves independently first, then combine their timing so direction and scale changes do not lose the subject.