How many times has this happened to you?
You start to fall, but then catch yourself and continue on your way.
Well, new research shows that falling and catching yourself actually happens every time we take a step.
And that we precisely place our feet as we walk to avoid taking a tumble during this ambulatory balancing act.
The study is in the journal Biology Letters.
When humans walk, we put one foot in front of the other.
But the way each foot lands can vary from step to step.
This variation in foot placement can appear pretty random.
But researchers decided to take a closer look.
They fitted 10 volunteers with motion caption markers and then watched as the subjects walked on a treadmill.
The investigators discovered that that they could predict exactly where each foot would fall based on the movement of the person's pelvis during the previous step.
The body falls forward and sideways as we walk…and the feet come down in a way that restores our balance.
The findings could be useful for developing ways to help people with movement disorders regain their stability.
The info could also make walking robots more surefooted.
So they don't, ya know, fall down on the job.
1.in front of在…前面
Waiting her chance, the girl nipped in front of an old woman.
She spent hours in front of the mirror, combing through her long hair.
2.base on 基于，以……为根据
Russia had a maritime base on the Pacific before it had one on either the Baltic orthe Black Seas.
However, such cooperation must base on trust, negotiation, equality and mutual benefits. It must proceed from actual facts, rather than deductions.
然而，这种合作必须建立在信任、协商、平等和互利的基础上，必须从 事实出发，而不是依凭推论 。