每种粒子云或者模拟物体都有多种类型力场影响。
Each particle cloud or simulated object can have multiple forces applied to it.
位势流忽略(必需调整或者模拟)了重要的物理现象，如粘滞效应和断波现象。
Potential flow codes omit (or have to be tuned to mimic) important physical phenomena such as viscous effects and breaking waves.
如果系统的变量都是时间的连续函数，就称为连续变量系统或者模拟系统，其描述方程为微分方程。
The system that all its variables are continuous functions of time is called continuous-variable or analog system; the describing equations are differential equations.
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