13名平均年龄为62岁的健康男性与女性在跑步机上走路，研究人员在他们的脚前放上一块薄木块，这些志愿者们不得不跨过这个木块才能在跑步机上继续走路。
Thirteen healthy men and women, averaging 62 years old, walked on a treadmill. Then the researchers placed a thin wooden block on the treadmill headed towards them.
我亲眼看到许多有此伤的跑步者原本可以被相当容易地治愈，但是，他们继续跑好几个月，每一步带着同样的，挥之不去的疼痛。
I have seen it myself with many runners that could have been quite easily treated. Instead they have continued for months with the same kind of nagging pain in each stride.
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