be completely worn out 累垮
completely worn out
完全磨损
以上为机器翻译结果，长、整句建议使用 人工翻译 。
By that point, his shoes were completely worn out, so he had to return home barefoot.
那时，他的鞋子已经完全磨损了，所以他只能赤脚回家。
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