There is no marked qualitative difference between the two.

二者在质量上无明显差别。

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The quantitative change has beguntomake a qualitative difference.

数量上的变化正带来质量上的变化。

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The quantitative change has begun to make a qualitative difference.

量的变化已经导致质的区别。

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There's a qualitative difference here.

它们之间存在着性质上的差异。

耶鲁公开课 - 旧约导论课程节选

Scaling in the social sector means understanding the best approach to making a more meaningful qualitative difference with respect to a social issue.

FORBES: What's Your Scale For Good?

But while it is true that North Korea's proliferation activities threaten global security, it is also true that there is a qualitative difference between the regimes in Pyongyang and Teheran.

CENTERFORSECURITYPOLICY: South Korea, North Korea, Israel & Iran

There is little qualitative difference between accusing Israeli society of destroying democracy for seeking to defend itself against foreign political subversion, and accusing Jews of destroying morality for failing to embrace foreign religious faiths.

CENTERFORSECURITYPOLICY: An ally no more