鱼胶原蛋白在照相底片，生物材料和食品行业有特殊的应用。

The fish collagen has special application in the photographic negative, the biological material and food industry.

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首先，把一个照相底片覆盖上感光材料。

First, a photographic plate is coated with a light-sensitive material.

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这个过程非常简单，首先，把照相底片用感光材料包裹起来。

The process is very simple. First, a photographic plate is coated with a light sensitive material.

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