1946年，世界上出现了第一台电子数字计算机“ENIAC”，用于计算弹道。
In 1946, there have been the world's first electronic digital computer "ENIAC", used to calculate the trajectory.
一个名为“子弹飞行”的iPhone应用软件可以让狙击手为射击计算距离和弹道，通过内建的卫星定位功能还能把本地天气状况的影响计算在内。
An iPhone app called Bullet Flight enables snipers to calculate range and trajectory for their shots, and built-in satellite-positioning allows local weather conditions to be taken into account.
以烧蚀火炮的阳线磨损曲线和一种挤进压力计算方法为基础，建立了考虑弹带挤进过程的内弹道模型。
Based on the wear curve of lands of erosion guns and a calculation method of engraving pressure, an interior ballistic model with the engraving process is established.
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