...分成两大类：一类是有一定规则的、简 单而明确的问题，即算子和问题空间界定明确的问题，称结构良好问题(Well-structure Problem)；另一类是规则和条件不明确、算子不清楚、具有很大不确定性的问题，称结构 不良问题(ill-structure problem)。
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The problem lent itself well to a relational representation, especially as it was not necessary to store the contents of the visited pages, just their structure and metadata.
这个问题可以借助关系表示来很好地解决，特别是因为这种方法不需要存储已访问页面的内容，只需要存储它们的结构和元数据。
The problem, though, is that most people picture immediately a very simple hierarchical structure with well-defined levels, such as the master-subordinate relationship.
尽管如此，问题是大多数人会立即绘制出拥有定义明确的层次的简单层次结构，例如主次关系。
The changes are obviously subtle while keeping the basic structure of the cat drawing and they make for a considerably better logo but the problem is, well, the original drawing.
显然微妙的变化，同时保持猫的绘图的基本结构和它们在相当做出更好的标志，但问题是，好了，原来的图纸。
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