是说你换算的时候换算错了吧？
Im sorry, I made a mistake when converting the unit into inches, and thus had a wrong estimation of the length of the belt. Can I apply for a refund?
十分抱歉，由于我在换算单位的时候搞错了，以致错误估计了皮带的长度，我可以申请退款吗？
I'm really sorry. I made a mistake when caculating in inch, and provided a wrong dimension of the belt. I wonder if the refund is possible.
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