抛物线零点
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hyperbolic zero
双曲零
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Based on theory of hyperbolic linear partial differential operator, the initial value problem of a kind of quasi-linear hyperbolic equations with non-zero initial values was introduced and studied.
基于双曲型线性偏微分算子理论，引入并研究了具有非零初始值的拟线性双曲型方程的定解问题。
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