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A few days ago, US has tested a new design of powerful weapon, a railgun.
The basic principle of this weapon is using electromagnetic (EM) force to drive the projectile, not like conventional weapons which use chemical explosion.
This weapon has larger distance of shoot (about 370 km) and higher impact (at five times of the speed of the sound, or Mach 5).
This is a very lethal weapon! I don't know what is the intention of developing such a new weapon, especially for America, who always acts like an international police.
