Through constitution of PM spacedensity function, the stress-strain state equation for saturated rocks has been defined and the hysteresis loops of axial stress-radial stress has been simulated.
通过构筑PM空间密度函数，求出饱和岩石的应力—应变状态方程，并模拟了其轴向应变—径向应变滞后回线。
2
In America, the optimum density for the best use of road space is around 50 vehicles per lane-mile.
在美国，道路最佳使用效率的理想车辆密度大约是每车道英里50辆车。
3
Europe's higher human-population density leaves less space for energy crops.