But the barrel on tested railguns, Clark said, had to be replaced after about 12 to 24 shots were fired.
克拉克表示,但是已测试轨道炮的炮管在发射大约12到24发后就必须更换。
我的VOA
A normal gun can be fired about 600 times before the barrel has to be refurbished. But the barrel on tested railguns, Clark said, had to be replaced after about 12 to 24 shots were fired.
A railgun is an electromagnetic projectile launcher based on similar principles to the homopolar motor. A railgun uses a pair of parallel conductors, or rails, along which a sliding armature is accelerated by the electromagnetic effects of a current that flows down one rail, into the armature and then back along the other rail.