Our conditions imposed on the nonlinear term are very easy to verify.

我们施加于非线性项的条件非常容易验证。

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Here, the nonlinear term is bounded below and need not be nonnegative.

这里，非线性项是下有界的并且不需要是非负的。

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The nonlinear term in the equation may have singularity and discontinuity in its variables.

方程中的非线性项关于其变量可以具有奇性和间断性。

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