time-varying feedback的用法和样例：
例句
- Robust output feedback stabilization was studied of uncertain discrete systems with a certain kind of norm-bounded time-varying uncertainty.
摘要研究了一类具有范数有界时变不确定性的不确定离散系统的输出反馈鲁棒镇定问题。 - The output-feedback adaptive control problem was investigated for a class of stochastic nonlinear time varying delay systems driven by stochastic noise of unknown covariance.
摘要针对随机噪声具有未知协方差的一类随机非线性时变滞系统，研究了输出反馈自适应控制问题。
