How 7r causes this is not yet known. It may stem from behavioural differences or it may be that different versions of DRD4 have different effects on the way the body processes food.

还不知道7r是如何引起这种结果，可能是源于行为差异，或可能是不同的DRD4的变异体对消化和吸收食物的途径的影响不同。

youdao

Molecular studies paint a potentially bleak picture, but researchers warn that the effects and causes of these differences are unknown.

分析结构研究描绘了一幅潜在的无遮掩的图画，但是研究者们警告这些不同之处的影响和原因还是未知的。

youdao

The addition of the core naps causes some other differences from the Uberman schedule as well.

核心睡眠的增加也带来了和Uberman计划的其它不同。

youdao

Many councils would be able to make significant savings by identifying and eliminating the causes of differences in costs, it added.

BBC: Audit Commission urges social care savings of ?300m

Survival rates for breast cancer in the UK in particular have improved and while the researchers will examine the causes of the differences in future papers, it seems late diagnosis of cancer remains a problem.

BBC: UK cancer survival rates lag behind other countries

OK, all this is a long way short of proof that traffic density alone causes these differences.

BBC: Crashes