问题描述：
翻译一下下面的句子中spare的意思!
-We sent off the shipment of spare parts on the fifteenth.
-Are you certain about that ? We still haven't received it ,and today is already the twentieth.
-We sent off the shipment of spare parts on the fifteenth.
-Are you certain about that ? We still haven't received it ,and today is already the twentieth.
问题解答：
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