The scale of development and utilization of urban underground space expands with the enhancement of urbanization and economy level in a city.
随着经济水平和城市化水平的不断提高，城市地下空间开发利用规模不断扩大。
Urban distribution scale bigness so compensation of reactive power in urban distribution is very important for detract consume economy energy sources ameliorate voltage quality.
摘要城市配电网的规模巨大，因此配电网无功补偿对降损节能，改善电压质量意义重大。
In recent years, the economy amount, population of Beijing increase rapidly, the city scale enlarged suddenly, and thus brings large press to the urban traffic.
近年来，北京市的经济总量迅猛增长，城市人口不断膨胀，城市规模急剧扩大，由此也给城市交通造成巨大的压力。
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