Last year, Usain Bolt stunned athletics fans when he hacked 0.11 seconds off his previous world record for the 100-metre sprint. But what's the ultimate human speed limit?
去年，田径短跑冠军博尔特以提前0.11秒的成绩打破了他之前保持的百米世界纪录，那么人类速度的极限在哪里呢？
Last year, Usain Bolt stunned athletics fans when he hacked 0.11 seconds off his previous world record for the 100-metre sprint. But what's the ultimate human speed limit?
去年，田径短跑冠军博尔特以提前0.11秒的成绩打破了他之前保持的百米世界纪录，那么人类速度的极限在哪里呢？
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