Even the things that are easy in an HDBMS are likely to be relatively hard in an RDBMS.
在HDBMS中即使很简单的一些事情到了RDBMS中往往会相对地困难一些。
In a hierarchical database (HDBMS), you begin with a strictly defined tree of data nodes.
在层次数据库(HDBMS)中，首先是从严格定义的数据节点树开始的。
In this sense, objects are similar to branch nodes of an HDBMS, which likewise contain a bundle of child nodes.
从这个意义上说，对象与HDBMS的分支节点很象，它同样也包含许多子节点。
However, the things that are extremely hard in HDBMS (all but a very limited few) are only moderately hard in an RDBMS.
不过，在HDBMS中极其困难的事(几乎非常少)在RDBMS中的难度只是中等。
You can ask essentially any question you want of an RDBMS, but for an HDBMS you can only ask the questions designed into the system.
本质上，您可以问任何有关 RDBMS的问题，但对于HDBMS，只能问一些设计到系统中的问题。
In an HDBMS like the one illustrated above, the only way to discover this would be an extremely costly search of every book leaf node.
在上面举例说明的HDBMS中，找到答案的唯一方法是搜索每个书籍叶节点，而这样做的成本极其高。
In an HDBMS like the one illustrated above, the only way to discover this would be an extremely costly search of every book leaf node.
在上面举例说明的HDBMS中，找到答案的唯一方法是搜索每个书籍叶节点，而这样做的成本极其高。
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