25%的搜索结果是世界前20大品牌，这都是由用户生成的内容。
25% of search results for the World's Top 20 largest brands are links to user-generated content.
约有70%的优酷网内容获得了广播公司等合作伙伴的授权，剩余的是由用户生成的，或是由优酷网自己制作的。
About 70% of Youku's content is licensed from broadcasters and other partners, and the remainder is generated by users or produced by Youku itself.
由呈现程序生成的组件需要和我们迄今为止所讨论过的比较简单的组件一样，对于用户是可访问的，这意味着我们必须能够设置其可访问性值。
Components generated by the renderer need to be as accessible to the user as the simpler components we've discussed so far, which means we have to be able to set their accessibility values.
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