There is no systematic difference in membership between the group of mechanics who do first-time jobs and the group of those who do rework jobs.
在第一次工作的技工组和返工的技工组之间没有系统性差异。
A systematic review of 162 scientific papers published in the scientific literature over the last 50 years, however, found there was no significant difference.
但是，系统地研究了过去50年出版在科学文献里的162篇科学论文后，发现并无多大的不同。
There is no significant difference occurs among the living quality of systematic diseases' patients.
各系统疾病患者的生活质量无差异；
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