用户可以在App Store中通过短视频来直接观察应用的特性、功能和用户界面，而这个短视频便是应用预览视频。
An app preview demonstrates the features, functionality, and UI of your app in a short video that users can watch directly on the app Store.
和应用图标类似，预览视频的海报是用户在产品详情页上看到的第一个元素，所以请确保画面在视觉上是引人注目的，且传达了应用程序的精华。
Like your app icon, your preview poster frame is one of the first elements a user will see on your product page, so ensure the frame is visually compelling and conveys the essence of your app.
前两张截图最好能传达应用的精华，如果没有设置预览视频的话，这两张截图是能够显示在搜索结果中的。
Your first two screenshots should encapsulate the essence of your app, as these images display in search results when no app preview is available.
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