Most mechanical storage systems are simple, composed either of a single sequence of stored objects (like a bookshelf) or a series of sequences, one level deep (like a file cabinet).
大多数机械存储系统是简单的，不是由简单的存储对象序列(诸如书架)组成的。即使是一系列的序列，深度只有一层(好比文件柜)。
Most mechanical storage systems are simple, composed either of a single sequence of stored objects (like a bookshelf) or a series of sequences, one level deep (like a file cabinet).
大多数机械存储系统是简单的，不是由简单的存储对象序列(诸如书架)组成的。即使是一系列的序列，深度只有一层(好比文件柜)。
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