就是从服务器下载数据块在同一时间和顺序。
That is to download chunks from servers at the same time and in order.
AsyncTask不是一个解决方案，因为它也不能下载数据块。
AsyncTask is not a solution, as it also doesn't download chunks in order.
AsyncTask不是一个解决方案，因为它也不能下载数据块。
AsyncTask is not a solution, as it also doesn't download chunks in order.
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