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英语翻译Further design possibilitiesThere are many opportunities

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英语翻译
Further design possibilities
There are many opportunities to further reduce either the need for ventilation,or the proportion of the year that it will be needed.Many of these present considerable technical difficulties but,if overcome,could significantly reduce the impact of subway systems on the environment.Opportunities exist in the development of noise control for tunnel ventilation fans,regenerative breaking,external resistor grids and platform edge doors (PED).PED in particular can result in a 75% reduction in station heat loads at the cost of a larger capital investment and increased maintenance.
英语翻译Further design possibilitiesThere are many opportunities
进一步设计的可能性
有很多机会可以进一步减少通风的需要或者它被要求的那一年的比例.很多这样目前相当多的技术难题一旦被攻破,可以极大地减少地铁系统对环境的影响.机会存在于隧道通风风扇噪音控制的发展,再生的刹车(装置),外部电阻器栅格和站台边门(PED).特别是PED可以以加大资金投资和增加维护为代价来实现站台热负荷75%的减少.