也许一个良好的地铁系统，是减轻交通阻塞的唯一有效方法，可是建设成本非常高。
The subway with a good system may be an effective way to reduce traffic jam, but the cost of construction is too high.
这对环保也会很有利，能节省燃油，减轻交通阻塞，减少空气污染，还可用作公路扩建的替代办法。
This could prove to be an environmental boon as well, saving fuel, reducing traffic jams, decreasing air pollution, and serving as an alternative to highway expansion.
中国北京国际科技产业博览会一名参观者说：“我真的希望这个系统可以在未来减轻交通阻塞问题。”
Visitor to CHITEC Expo said, "I really hope the system can ease Jams in the future."
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