Overall one pair free postage, two pairs of free postage (another minus $ 10)的翻译：House a pair of postage-free, 2-free postage (minus $ 10) 什么意思？中文翻译英文，英文翻译中文，怎么说？

青云英语翻译

Overall one pair free postage, two pairs of free postage (another minus $ 10)

House a pair of postage-free, 2-free postage (minus $ 10)

An entire audience pair exempts the postage, 2 pairs exempt the postage (to reduce 10 Yuan in addition)

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House a pair of postage-free, 2-free postage (minus $ 10)