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靴， 沓， 履， 鞋， くつ
1. shoe, shoes, boots, footwear, footgear
tbd
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磨り減る， すり減る， 擦り減る， 摩り減る， すりへる
1. to be worn down, to wear away, to wear out
2. to dwindle, to be reduced
磨损；逐渐减少；逐渐变小
は
1. indicates sentence topic
2. indicates contrast with another option (stated or unstated)
3. adds emphasis
指示句子的主题；表示与另一选项（无论是否明确提及）形成对比；表示强调
