求翻译：1991年，他们重新对感知质量进行了界定，引入了容忍区域的概念，由此，期望与绩效比较被分成了两部分，即感知服务优势差距(perceived service superiority gap)和感知恰当服务差距(perceived service adequacy gap)。是什么意思？

1991, they re-perceived quality, defined in the introduction of the concept of tolerance regions, As a result, expectations and performance is divided into two parts, namely, perceived service advantage of the gap (perceived service superiority gap) and the perception of the appropriate service gap

In 1991, they carried out the perceptual quality of defining, introducing the concept of tolerance zones, look forward to working with, and the resulting performance comparison have been divided into two parts, i.e. , service-aware advantages perceived service gap (gap) and perceived superiority ser

In 1991, they have carried on the limits again to the sensation quality, introduced has tolerated the region the concept, from this, expected and the achievements comparison has been divided into two parts, namely sensation service superiority disparity (perceived service superiority gap) and sensat

In 1991, they renewed the perceived quality has been defined, introduced the concept of tolerance zone, thus, expectation and performance comparison is divided into two parts, namely advantages perceived service gap (perceived service superiority gap) and the perception of appropriate service gap (p

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