The Earth is suffering from a wave of ruthless aggression, and now only the Earth's defense system can withstand these aggressions. Control the defense system to eliminate the invaders and guard the peace of the earth!
地球正遭受着一波无情的侵略,现在只有地球的防御系统才能承受这些侵略。控制防御系统,消灭侵略者,保卫地球和平!