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Just ask any one of the 300,000 Americans who develop kidney stones: What if the excruciating pain of passing one of those little devils could be prevented by strapping yourself into a make-believe runaway mine train, throwing your hands in the air and enduring G-forces as high as 2.5 for about three minutes? Would you do it? 从30万患肾结石的美国人中去随便找个患者问问：若乘坐一辆越矿飞车，飞车如逃离般飞驰而过时手在空中乱舞，还要承受高达2.5G的重力三分钟，就能免去排出那些小个恶魔时的剧痛，你会去做吗？ | 
