... 一阶时间导数 first time derivative 二阶时间导数 second time derivative 输入对时间的导数 Derivative ...
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The second time derivative is the constant acceleration.
它的二阶导数就是这个恒加速度。
Moreover, due to the dynamic equations of LPMs with second-order derivative terms in time, the resulting structure-foundation-soil system can be solved by an explicit time-integration method.
此外，由于模型的动力方程具有二阶时间导数项，因而应用本文模型的结构—基础—土系统可以采用显式时间积分求解。
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