求翻译：建立在状态空间法基础上的一种控制理论，是自动控制理论的一个主要组成部分。在现代控制理论中，对控制系统的分析和设计主要是通过对系统的状态变量的描述来进行的，基本的方法是时间域方法。现代控制理论比经典控制理论所能处理的控制问题要广泛得多，包括线性系统和非线性系统，定常系统和时变系统，单变量系统和多变量系统。它所采用的方法和算法也更适合于在数字计算机上进行。现代控制理论还为设计和构造具有指定的性能指标的最优控制系统提供了可能性是什么意思？

Based on the state space method based on a control theory, automatic control theory is a major component. In modern control theory, control system analysis and design of the system mainly through the state variables for the description of the basic method is time-domain method. Modern control theory

Based on space law establishing the State of a control theory, and it is a major component of the automatic control theory. In the modern control theory in the control system, primarily through the analysis and design of the system of state variables, describe the basic method is time domain methods

Based on State space method based on control theory%