在同一时期，人类逐渐开始适应城市生活，目前有60%的人口分布在城市的纵深之中。
Within that same time frame, we evolved into an urban species, in which 60% of the human population now lives vertically in cities.
一方面却有更多的河水被抽走，供应城市、灌溉和沥青炼油所需。
But more water is being drawnfrom them for cities, irrigation and the processing of oil from tarsands.
这时，您将应用一个对关联记录列表的过滤器，只选中相应城市的记录，城市由 largestCityVar sessionScope 变量来指定。
This time, you will apply a filter to the Relational Record List to select only the records that correspond to the city, as specified by the largestCityVar sessionScope variable.
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