单词	F region
释义	F region noun : the highest region of the ionosphere occurring from 80 miles (130 kilometers) to more than 300 miles (500 kilometers) Word History First Known Use 1923, in the meaning defined above
随便看	heavy chemical heavy concrete heavy cream heavy cruiser heavy dactyl heavy date heavy going heavy goods vehicle heavy hand heavy heart heavy hitter heavy hitters heavy hydrogen heavy industry heavy lifting heavy liftings heavy liquid heavy man heavy metal heavy mineral heavy nitrogen heavy oil heavy oil of wine heavy on heavy on one's hands

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