wǒ / men / xiān / bǎ / zhè / ge / chā / fēn / fāng / chéng / gǎi / xiě / chéng / gèng / róng / yì / jì / suàn / de / xíng / shì

我们先把这个差分方程改写成更容易计算的形式。

We first rewrite this difference equation in a form that is easier to calculate.