科学美国人60秒 SSS 2014-10-09

（单词翻译）

 ctually happens every time you take a step. And we precisely¹ place our feet we walk to avoid taking a tumble doing this and doing balancing act.The study is in the draw biology letters.When humans walk,we put one foot in front of the other,but the way each foot lands can bary from step to step. It's very acing² that footprints can be pure a pretty random,but the researchers decide to took a closer look. They field in ten volunteers with motion capture markers,and then watched the subjects walk down the trade mile . The investigators³ just discovered that the could predicted exactly where each foot would fall ,based on the movement of the person's powers ,doing the previous step. The body falls forward in sideways as we walk and the feet come down it way that restore our balance. The findings could be useful for a developing ways to help people with movement disorders⁴ to gain their agility⁵ ability. The inbox also making robots more short footed .So they don't you know,fall down on the job.