initial firing

例句：

1. 1. The first shots were fired at the enemy from a distance of over a mile.
   第一次射击是从一英里多远的地方对敌人进行的。
2. 2. The initial impact of the new policy was significant.
   新政策的初现影响是显著的。
3. 3.The initial firing of the cannon caused a loud noise that echoed throughout the valley.
   大炮的初次发射产生了响亮的声音，在整个山谷中回荡。