The researchers used a machine called an "electroretinogram" to test the field of vision - firing a tiny beam of light at the shark in a darkened tank from all directions.

研究人员利用“网膜电图”机测试视野——在一个黑暗的箱子里从各方位向鲨鱼发射一丝微弱的光。

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First the machine takes off and hovers above the ground by firing downward-facing nozzles.

首先这种机器启动后加热朝下的喷嘴，会在地上盘旋。

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The antitank SPG-9 "Kopyo" (" Spear ") grenade machine is not an automatic but recoilless gun. It consists of a trunk with a lock, a tripod stand and an electric mechanism which serves for firing.

这种反坦克spg - 0“Kopyo ”飞弹机是非自动无后座力炮，包含一个带锁箱，一个三脚架和一个开火用的电气机械装置。

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Evidence suggests he was hit by a fellow soldier who was firing a machine gun at a stationary target.

BBC: Michael Maguire

Evidence suggests a fellow soldier firing a machine gun at a designated target placed on the range hit Ranger Maguire.

BBC: Ranger Michael Maguire

And the Iraqis would be sitting there, with the machine guns firing, firing, firing, killing a lot of these guys but there would be more coming, and these machine guns would just heat up and jam.

NPR: Saddam's Past with U.S. Has Implications for Iraq