meteor shower陨石雨; meteorite陨石，流星; meteor strike陨石撞击; crater陨石坑; vapour trail 蒸汽尾迹; shockwave冲击波; rescue worker救援人员; West Siberian region西西伯利亚地区; Ural Mountains乌拉尔山脉; asteroid小行星; thinly populated area人烟稀少地带
