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。
2
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.