AssetBundle 变体。
当指定该属性时，该属性会转换为小写并附加到 assetBundleName 属性（就像文件扩展名一样），以构建完整的 AssetBundle 文件名。
AssetBundle 变体用于在 AssetBundle 中实现虚拟资产。具有相同 assetBundleName 属性的每个 AssetBundle 都会拥有等效 Object 的相同内部 ID。例如，一个变体可能包含高分辨率图片，而另一个变体可能包含匹配的低分辨率图片。其他 AssetBundle 可以引用这些图片并根据加载的版本解析为高分辨率或低分辨率等效版本。
各 AssetBundle 变体应具有匹配的资产列表才能正常运行。
其他资源：AssetImporter.assetBundleVariant。
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