国际上一向认为，对非线性电路与系统进行符号分析是十分困难的。
It's long worldwide known that it's extremely difficult to process symbolic analysis in nonlinear circuits and systems.
国际上一向认为，对非线性电路与系统进行符号分析是十分困难的。
It's long worldwide known that it's extremely difficult to process symbolic analysis in nonlinear circuits and systems.
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