Since the output of one industry (steel, for example) serves as an input for another (construction), one cannot solve any equation without solving them all simultaneously.
由于一个行业的产出总是会作为另一个行业的投入，因此除非能同时解出所有的方程，否则你一个也解不出。
2
The roots of the characteristic equation determine the stability of the system and the general nature of the transient response to any input.
特征方程的根决定了系统的稳定性以及对各种输入的响应特性。
3
The numerical results were obtained in a table by solving the combined equation of transmission line impedance transfer equation and terminal input impedance expression in gas capacitance.