平均有效度
基于1个网页-相关网页
平均可用度
平均可用性
observed mean availability 观测平均利用性
·2,447,543篇论文数据，部分数据来源于NoteExpress
And the growth of video on the Internet will mean the availability of more programming for tinier niches still.
ECONOMIST: Digital follies
The limited availability of handsets, the lack of content to browse and the slow connection speeds mean the WAP experience has failed to live up to the advertising hype.
BBC: Children using mobile phones
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