虽然许多地区都有人口普查的统计数字，但可靠性参差不齐，也没有提供语言结构及语言社会用途方面的信息。
While census Numbers exist for many areas, they vary in reliability and provide no information about the structure of languages or their use in society.
失业这样重要的因素也要被忽略掉，因为数据质量参差不齐，不具可比性。
The data on unemployment were too spotty to be comparable and so this important factor is discounted too.
这种一致性对于那些团队成员水平参差不齐或是项目需要长期维护的组织来说是个巨大的优势。
Such consistency is a major bonus for organisations with teams of differing skill sets or projects that will require long-term maintenance.
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