Olympic host cities have traditionally obtained the metal from mining firms.

奥林匹克主办城市向来是从矿产公司购入金属。

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Since then, the IOC has become increasingly aware that the responsibility lies with the Olympic movement to provide concrete practical solutions for candidate and host cities.

自那以来，国际奥委会日益意识到，奥林匹克运动有责任为候选城市和主办城市提供切实可行解决方案。

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Organisation of each Olympic Games now includes nearly 150 criteria for measuring their consequences to host cities - from environmental to social and economic aspects.

如今，每届奥运会的组织工作包括近150项标准，用来衡量它们对主办城市的影响——从环境到社会和经济的各个方面。

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Despite lofty ambitions, Olympic host cities often have seen disappointing economic-development results from the Summer Games.

WSJ: London Developers Hope for Olympic-Size Boom

Olympic budgets submitted by prospective host cities fall into three categories.

FORBES

There is little data on the economic impact on Olympic cities, but Mr Baade studied what the 1994 soccer World Cup did to its nine American host cities.

ECONOMIST: Britain's Olympic bid