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直接存取存储器比顺序存储器要快多了。
Direct access storage is much faster than sequential storage.
一般来说，直接存取和遍历存取都需要知道内部节点的结构。
In general, both direct and traversal access require knowledge of the internal node structure.
正如已经看到的，遍历存取和直接存取都需要知道图书的位置。
As you've already seen, traversal and direct access require positional knowledge of the articles.
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