写定义交通密度，哪里是公路段的长度。方程(1)现在可以用密度来书。
Define traffic density as, where is length of the road segment. Equation (1) can now be written in terms of density.
对差分方程的研究就是讨论它的解的最终性态，包括振动性、循环长度及全局渐近稳定性等。
The investigation on difference equation is to discuss its eventually behavior of the solutions, including oscillation, cycle length and global asymptotic stability, etc.
求出了丰度方程的近似解，从而计算得到热扩散级联的长度及同位素浓缩产品的丰度。
The solutions of the differential equations are calculated, through which the length of thermal diffusion cascade and the abundance of isotope products are calculated.
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