当你看到白色的中底材料已经穿透大底，或者脚跟处的大底看起来已经裂了，那么这双鞋早就寿终正寝了。
When you can see white midsole material poking through the outsole or when the sole under the heel looks crushed, the shoes are long past their prime.
厂商建议你可以在日常活动中穿着圆弧底鞋，开始的时候穿的时间短一些，有一个逐步适应的过程。
Manufacturers recommend you wear them during your normal activities, starting with short periods until you get used to them.
20世纪70年代初期，俄勒冈大学的竞赛教练比尔鲍尔曼在他太太的比利时格子饼贴膜上加热聚氨酯，打造出第一个有软垫的鞋子中底，后来促成了Nike Air运动鞋的问世。
University of Oregon track coach Bill Bowerman created the first cushioned mid-sole by heating polyure-thane on his wife's waffle iron in the early 70s, which later led to the creation of Nike Air.
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