Like any other media, backups are essential.
象其他媒体一样，备份很重要。
Legal protection and positive, or at least, unbiased media representation are essential in this struggle.
法律上的保护以及正面或至少没有偏见的媒体报道和反映不可或缺。
Among all the channels, the media are playing an essential role in social learning.
其中，大众传媒在推进艾滋病教育工作中发挥了极其重要的作用。
Among all the channels, the media are playing an essential role in social learning.
其中，大众传媒在推进艾滋病教育工作中发挥了极其重要的作用。
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