與流星有關的詞: meteoroid,meteor,meteorite 流星的種類: stony meteorite, iron meteorite, stony-iron meteorite 太陽系的組成部分:solar system,asteroid belt, Mercury,Venus,Earth, Mars,Jupiter, Saturn, Uranus, Neptune 普星的組成部分:nucleus,coma,dust tail,gas tail yearafteryear 年復一年地;每年 at work起作用;發揮效用 name after...以.....·命名 the instant...-......就，當......時 once in a while 偶爾;有時 be surrounded by...被·.....包圍 when引導的時間狀語從句，例如: When she ran outdoors,shediscovered that a football-size meteorite had struck her family'scar. where 引導的地點狀語從句，例如: Holes called craters mark thespots where asteroids have hit the moon. “in the past...years+ 完成時”句型，例如: In the past 30 years,these teams have found more than 16,000 meteorites.