求翻译：天府新区内的轨道交通体系目前已规划了360多公里的总里程，大致规划标准是每平方公里为0.5公里的密度，比中心城区还高是什么意思？

Tianfu new regional rail transit system has been planned for a total mileage of more than 360 km, broadly the standard density of 0.5 kilometers per square kilometer, is even higher than the central urban area

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In the day government office newly developed area orbital transportation system has at present planned more than 360 kilometers total courses, plans the standard is approximately each square kilometer is 0.5 kilometers density, is also higher than the central city

Rail transport system in tianfu district is currently planning a total length of more than 360 miles, general planning standards of density per square kilometre is 0.5 km, higher than in downtown

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