来自《耶鲁大学开放课程：生物医学工程探索 第19集 第19集》
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As your speed increases you create inertia.随着速度增大你的惯性也增大 -
You create forward motion, and that forward motion你产生向前运动的趋势 而这种趋势 -
or inertia stabilizes your body.或者说惯性使你的身体稳定 -
It makes balance less of an issue.这基本解决了平衡问题 -
If you're moving forward at 5 mph,如果你以每小时五英里的速度前进 -
you're not worried about sideways motion so much就不必过于担心左右运动了 -
because you have this forward motion因为你具有向前运动的趋势 -
which is going to continue to carry you forward,它能使你不断向前运动 -
and balance isn't so much of a problem anymore.因此保持平衡就不太成问题了 -
You can sacrifice having both feet on the ground.你无需双脚同时着地 -
You can even sacrifice你甚至可以在一段时间里 -
having any foot on the ground for some period任何一只脚都不着地