How long do you think you could stand on your tippy-toes before you had to rest your heels on those iron spikes?
你觉得在你累到必须靠脚后跟踩到钢钉上来休息之前，你能靠脚尖支撑多久？
2
I walk around on my tippytoes.
我走在我的周围毛尖脚趾。
3
To find out whether our gait gives us any advantages, scientists asked 27 volunteers to walk on a treadmill all three ways: heel-first, ball-of-the-foot first, or up on tippytoes.