计算时间差。
测量结束后，再次拷贝和粘贴CPU时间值，并且计算CPU时间差。
After the measurement, copy and paste the CPU Time values again, and calculate the CPU Time difference.
文中设计了等离子体粒子模拟的计算机模拟实验方案，验证了有限大小粒子和时间差分方法引起的对于色散关系的偏离；
The computer experimental scheme to simulate the plasma particle is de-signed. The simulation result shows the effects of finite—size particle and time difference on dispersion relation.
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