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Geography
The study of physical characteristics of earth and the distribution and effects of life on earth, especially that of humans.
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青銅擺
Earth science; Mapping science
季米擺,由美國 S.海岸和大地測量,使用了鋁青銅由一個部件的鋁和銅的九個部分組成。從 1920 年開始,英華擺在美國 S.海岸和大地測量重力工作所取代了青銅擺。 ...