At the quantum scale, virtual pairs consisting of a particle and its antimatter equivalent are constantly popping into existence.

从量子层面来说，空间中一直不断出现由一个正粒子和与其对应的反物质组成的反粒子虚偶。

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Particle system based on GPU to simulate rain and snow is widely used in virtual scene simulation for its high efficiency.

在虚拟场景中采用基于GPU的粒子系统来模拟雨雪，因其效率较高，得到了广泛的应用。

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In the method particle trajectory model of certain aviation bomb is chosen, drag law by the numerical simulation based on the virtual wind-tunnel is adopted.

该方法选用航空炸弹质点弹道模型，采用虚拟风洞数值模拟得到的炸弹阻力定律，结合实弹靶试数据，对弹道系数进行了符合计算。

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