根据导出方程（2）的步骤，找出从材料2到材料1的电流的相似表达式。对总隧穿电流有。

Following the route that has led to Eq. (2), find a similar expression for the current from material 2 into the material 1. For the total tunneling current obtain.

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由拉格朗日方程导出系统的非线性控制方程。

The nonlinear governing equations of the system are derived from the Lagrange equation.

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介绍了光纤光学参量放大器的理论，基于耦合波方程推导出光纤光学参量放大器的增益表达式。

Theory of fiber optical parametric amplifiers (FOPAs) is introduced and the expression for the gain of FOPAs is deduced from the basic coupled wave equations.

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We can't actually go ahead and derive this equation of the wave function squared, because no one ever derived it, it's just an interpretation, but it's an interpretation that works essentially perfectly.

从这个方程中,导出，波函数的平方，没有人可以这样做，这仅仅是一种解释，但这种解释，能解释的很好，自从它第一次被提出来之后。

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