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	maula maulana mauled mauler maulers mauley maulie mauling maulkin mauls maulstick maulsticks maulvi maulvies maulvis mauma Maumee maumer maumet maumetries maumetry maumets maun Mauna Kea Mauna Loa

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