The Bullet 580, the world's largest inflatable airship, stands in Garrett Coliseum in Montgomery, Alabama, Wednesday, May 19, 2010, following an inflation test and fit check.
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作为世界上最大的高铁网络的安全以及支付能力的考虑，中国正在降低新子弹头列车的行驶速度。
China is lowering the operating speeds on its new bullet train lines because of safety and affordability concerns over the largest high-speed rail network in the world.
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