By using the finite element method, the dynamic stress caused by vertical contact impact between bolt locking surface and barrel extension locking surface of a new rifle was studied.
采用有限元方法研究了某新型自动步枪枪机闭锁面与节套闭锁面间垂直接触碰撞的动应力。
2
Several times I saw Captain Nemo stop and take aim with his rifle; then, after sighting down its barrel for a few seconds, he would straighten up and resume his walk.
好几次，我看见尼摩船长停步，瞄准他的枪，但经过一些时候的观察后，他又把枪放下，再向前行。
3
When these balls leave the barrel of a cannon or rifle they have an associated trajectory, velocity and so on and so forth.