这就是一个抛物线方程。

That is a parabola.

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同时推导出其电力线方程和电位线方程。

The force line and potential gradient equation are deduced.

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并利用特征线法，得到薄膜厚度的方程。

The equation for thickness of film was obtained by the method of characteristics.

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两条线在哪里相交，解这个方程就可以解答。

Where the two lines will cross is to be determined by solving the equation.

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两条线在哪里相交，解这个方程就可以解答。

Where the two lines will cross is to be determined by solving the equation.

youdao