结果表明，海水密度变化是引起季节性海面高变化的重要因素。

The result shows that seawater density change is an important factor on sea level height variation at seasonal time scale.

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表明，在研究许多地球动力学问题时，扣除海水密度变化引起的海面高变化至关重要。

The result shows that it is more important to separate sea level height variation caused by seawater density change in the study of Earth dynamic problem.

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模型考虑了地下水中溶解盐分浓度变化引起的地下水密度的改变，及其导致的地下水水头的变化。

In the model the fluid density variation due to solution concentration change and the head distribution variation resulted from the fluid density change are considered.

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So, instead of having the periodic variation of water, or the periodic variation of air density here we're talking about an electric field.

不像水或者空气密度的,周期变化，我们这里,讨论的是电场。

麻省理工公开课 - 化学原理课程节选