使用单等于号来向变量赋值，而不是像在前一个条件中那样使用双等于号 (==) 来比较值。

Use the single equal sign to assign a value to a variable, unlike the double equal sign (==), as in the previous condition, which compare the values.

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本文研究一类拟线性双曲—抛物型方程具有非线性初边值条件的奇摄动问题。

This paper deals with the singularity perturbed problem of a class of quasilinear hyperbolic-parabolic type equations subject to nonlinear initial-boundary value conditions.

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并证明忽略热噪声影响的条件，给出产生双光子激光对腔值的量级要求。

We proved the condition under which the thermal fluctuation can be neglected, and discussed, the character of laser cavity in which the two-photon laser can be produced.

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