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。

youdao

The two groups are chosen at random, so the remedy should be the only systematic difference between them.

这两个组是随机抽取的，所以他们在系统中的唯一区别就在是否接受治疗。

youdao

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。

youdao

Dr Skuse's results suggest a systematic difference between male and female behaviour that is under genetic control.

ECONOMIST: Genetics and behaviour

The researchers then approached a number of healthy people in order to compare them with the cancer patients, and find out if there was a systematic difference in mobile-phone use between the two groups.

ECONOMIST: The Interphone study: Mobile madness | The