Small meteorites have left impact craters all over the planet's surface.这个行星的表面布满了小块陨石留下的撞击坑.One theory about the existence of extraterrestrial life rests on the presence of carbon compounds in meteorites.地球外存在生命的理论...
Industrial waste burned on the surface of Lake Erie near Cleveland in 1970.1970年工业废物污染了克利夫兰附近的伊利湖湖面.Cleveland has always had a reputation for being a dirty, ugly, boring city, though now they say it is much better.克利夫兰一直...