There have long been quality measures such as the drilling difficulty index and the wellbore quality scorecard.

先前早就有表征井身质量的方法，如钻进难度系数和井身质量记分卡。

The idea was to get an index number to help estimate the difficulty of implementing processing tasks (such as creating an XSLT transform) for a vocabulary and the typical USES for the vocabulary.

基本的想法是：用一个序数字，来评估针对某个词汇表及其典型应用实现处理任务(如创建xslt转换)的难度。

Most of the issues revolved around difficulty in bookmarking and refreshing pages, and the inability of search engines — which don't support frames — to index the appropriate content.

大多数问题是有关难于创建书签和刷新页面，以及不支持框架的搜索引擎无法索引适当内容。