与流星有关的词: meteoroid,meteor,meteorite 流星的种类: stony meteorite, iron meteorite, stony-iron meteorite 太阳系的组成部分:solar system,asteroid belt, Mercury,Venus,Earth, Mars,Jupiter, Saturn, Uranus, Neptune 普星的组成部分:nucleus,coma,dust tail,gas tail yearafteryear 年复一年地;每年 at work起作用;发挥效用 name after...以.....·命名 the instant...-......就，当......时 once in a while 偶尔;有时 be surrounded by...被·.....包围 when引导的时间状语从句，例如: When she ran outdoors,shediscovered that a football-size meteorite had struck her family'scar. where 引导的地点状语从句，例如: Holes called craters mark thespots where asteroids have hit the moon. “in the past...years+ 完成时”句型，例如: In the past 30 years,these teams have found more than 16,000 meteorites.