他把背包和粒子枪给了约翰，然后向守卫走去。
He handed the satchel to John and holstered his gun. He then approached the guards.
他注意到德里克左手挎着一个背包，右手拿着粒子枪。
He noticed that Derek was carrying a satchel in his left hand, a gun in his right.
这种三维粒子模拟可以扩展到非对称的电子枪的模拟，如橱控电子枪，多注电子枪等。
This PIC simulating can be extended to gun with asymmetric construction such as grid-control gun and multiple beam gun etc.
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