This fire is not burning the ground fuels themselves like the litter or organic material in the soil but just on the surface, it's the movement of a fluid.

这种火不是像垃圾或土壤中有机那样燃烧地燃料本身，而是仅仅上，这是流体运动。

A substance that's not quite liquid or gas, known as supercritical fluid.

一种既不是液体也不是气体， 称为超临界流体。

It's important to note that fluid ounces measure volume, not weight, unlike the regular ounce.

需要注意是，流体盎司衡量是体积，而不是重量，这与常规盎司不同。

At this point,   the principles defining crowd movement are closer to fluid dynamics than anything else.

此时，定义人群移动原则更接近流体力而不是其他任何东西。