评价和分享关于图片警示有效性的信息。

Evaluate and share information about the effectiveness of picture warnings.

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询问关于图片中的人。

Ask about the people in the picture.

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longdesc用于提供一个URI，该URI指向关于图片的、与al t属性中的说明相比更详细的描述。

Longdesc is used to give a URI that points to a fuller description of the image than given in the Alt attribute.

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