After defining a simple hash of the colors considered to be valid precipitation, the image specified is loaded from disk.

在定义了被视为有效降水的简单颜色散列之后，将从磁盘载入指定的图像。

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An enumerated type is one that has valid values limited to a set of constants. For instance, an enumeration may be defined for the colors of a stop light as follows.

枚举类型是一种有效取值仅限于一组常量的类型。

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