这些应用软件可以通过PC软件同步到平板电脑，或者直接通过wifi或3g下载，软件的实物销售已经一去不复返了。
This can be synced through your PC software or done directly on the tablet via wifi or 3g, but the physical aspect of software is long gone.
它的本质就是人们可以下载信息单位，然后交易或者转让，这其实也是当前盈利性的实物交易系统中的一种形式。
Essentially people are able to download messaging units and trade or transfer them as part of what has become a lucrative barter system.
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