它是人类知道的第一种超流体——这种液体有一些很有趣的特性，包括完全没有粘滞性，一旦你让它动起来，便永无歇止，并且不会损失能量。
It's the first known superfluid, a fluid that has many interesting properties, including absolutely no viscosity, and it will never come to rest or lose energy once you start it in motion!
第二类模型为完全耦合模型，包括耦合温度场方程、流体耦合渗流方程和岩石耦合变形方程。
The second kind of model is complete coupling one and this model includes the coupling temperature field equation, fluid coupling seepage model equation, rock coupling deformation equation.
平坦的闸板底部与阀座之间能够实现全周长阀座密封，避免阀座出现可能淤积流体介质、妨碍阀门完全关闭的底部洞隙。
The flat bottom gate provides full perimeter seating against the seat, eliminating pocket in the bottom of the seat that can trap process media and prevent the valve from fully closing.
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