单词	D region
释义	D region noun : the lowest part of the ionosphere occurring approximately between 30 and 55 miles (50 and 90 kilometers) above the surface of the earth Word History First Known Use 1930, in the meaning defined above
随便看	paleogeographical paleogeographically paleogeographies paleogeography paleogeologic paleogeologies paleogeology paleogeologyes paleogeologys paleogeomorphology paleographer paleographers paleographic paleographical paleographically paleographies paleography paleohydrology paleola paleolae paleolate paleolith Paleolithic paleolithic diet paleolithic man

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