simple second order differential equation
简单的二阶微分方程
以上为机器翻译结果，长、整句建议使用 人工翻译 。
For the latter, since we transform the problem to seek to solve the second order differential equation into that of twice integrations, the calculating process is also simple.
后者由于把一个二阶微分方程的求解转化成为两次积分问题，也使计算过程简化。
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