After the sequence is created， there will be a series of English categories in the sequence panel. They are mainly for the camera to set the sequence， which is of little significance to us. We directly choose HDV 720p25 or HDV 1080p25. The corresponding long video ratio of 16:9 should be 1080p-19201080;
了解Pr的世界新建项目、序列Pr界面了解选择、轨道选择、剃刀工具常用工具：波纹编辑工具，滚动编辑工具，速率伸缩工具错落工具，滑动工具，钢笔工具，手形工具，缩放工具特效控制台：关键帧的使用素材替换与序列嵌套3种素材替换方法：（1）右击项目中的原素材，点击“替换素材”，选择新素材（2
