今年伊朗官员夸口伊朗已经研制出一种飞行半径超过1900公里的无人机。
This year Iranian officials said they had developed a new drone with a range of more than 1,900km.
亚内说，新的无人机索拉拉50将能够在地球上空近20公里的高空飞行，向420公里半径的地面提供因特网信号。它能在空中停留近5年。
He says the new drone, Solara 50, will be able to fly almost 20 kilometers above the earth, providing the Internet signal in a radius of almost 420 kilometers... and stay aloft for almost five years.
计算结果表明，粒子初始温度、半径不同，粒子参数随飞行距离的变化也不同。
The results show that the change is different with the initial parameters of the particles.
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