linear time-invariant systems的用法和样例：
例句
- The state-space representation and the transfer function representation of fractional order linear time-invariant systems are introduced.
摘要介绍了分数阶线性定常系统的状态方程描述和传递函数描述。 - Starting with Lagrange equations of the first kind, pure differential equations of multibody systems with rheonomic constraints are established.
根据变换方程与约束方程显含时间的等价性，提出了定常约束与定常系统判据的等同表述。
