When nonlinearities and time variations are present, the very basic for these classical techniques is removed.

一旦出现非线性和时变性，经典技术最根本的基础就不复存在了。

youdao

When nonlinearities and time variations are present, the very basic for these classical techniques is removed.

一旦出现非线性和时变性，经典技术最根本的基础就不复存在了。

youdao