如果上面的网布看起来呈拉伸或者撑起来的样子，那就说明脚在中底上打滑了，或者大底的花纹已经磨光了，就该买新跑鞋了。
If the upper appears pulled or stretched so that the foot is sliding off the midsole, or the grooves on the outsole are worn smooth, it's time for new running shoes.
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.
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