First you'll need a background plate: a shot of a tornado swirling through the sky.

首先你需要背景：龙卷风从空中席卷而来。

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Sasa: ready to share with you a Polaroid, a careful design of the background plate, or is a small stage.

莎莎和您一起分享：准备一台宝丽来相机，一个精心设计的背景版，或是一个小舞台。

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Now comes the really boring part, you'll have to take a copy of your background plate, and place it at the top layer.

现在到了一个烦人的部分，你需要拷贝一份背景图层，将其放置在最上层。

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