求翻译：到2020年全市城镇建设用地总规模为850平方公里，其中市区建设用地规模为778平方公里，市区外围区域建设用地规模为72平方公里。是什么意思？

By 2020 the total size of the city's urban construction land of 850 square kilometers, including urban construction land area of ​​778 km2, land for construction of urban peripheral areas of 72 square kilometers.

By 2020, construction of towns and cities throughout the city with a total size of 850 square kilometers, of which the city-building for 778 square kilometers in size, the urban perimeter building size of 72 square kilometers.

The whole city cities construction uses the overall scale to 2020 is 850 square kilometers, in which urban district construction uses the scale is 778 square kilometers, the urban district periphery region construction uses the scale is 72 square kilometers.

By 2020 the city's construction in cities and towns with a total of 850 square kilometres, the scale of urban construction land of 778 km, scale of urban construction land in peripheral areas of 72 square kilometers.

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