And it turns out to be easier to study the behaviour of such fluids by looking at the barriers than at the bodies of fluid which those barriers separate.

要研究这一流动体的活动，通过观察其中的界限要比观察被界限切分出的群体容易的多。

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In this paper the mechanical behaviour of the fluid at the exit of a slit die has been analysed theoretically based on the basic law of hydromechanics.

本文从流体力学的基本定律出发，从理论上分析了流体在狭缝出口处的力学行为。

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