This density difference is an index of ocean stratification.

这种水密度差就是海洋分层的标志。

And the greater the density difference between the surface and deep ocean, the slower and more difficult the mixing becomes.

而表层和深海之间的密度差越大，混合的速度越慢且难度越大。

In winter, there is almost no density difference in the North Atlantic and the Barents Sea—as you would expect given the upwelling there.

北大西洋和巴伦支海在冬天几乎不会出现水密度差—鉴于那里的上涌现象，人们会有所期待。

And then over the course of billions of years, these density differences grew up to become clusters of galaxies in the great cosmic void.

然后在数十亿年的过程中，这些密度差异成长为巨大宇宙虚无中的星系团。

But the cosmic web had its origins but in the earliest moments of the big bang, where quantum fluctuations in space-time itself led to tiny little density differences.

但是宇宙网有它的起源，但在大爆炸的最初时刻，时空本身的量子涨落导致了微小的密度差异。

At the conference, a paper by Jean-eric Tremblay and Marcel Babin of Laval University, in Quebec, described the effect by reporting the density difference of water at the surface and at a depth of 100 metres in different oceans.

在这次会议上，魁北克拉瓦尔大学的让-埃里克-特伦布莱和马塞尔-巴宾提交的报告中，通过报告不同海洋海平面和100米深处不同的水密度，描述了这种效应。