For much of humans history, this ability has made salt valuable.
在人类历史的大部分时间里，盐的这种能力使得自身很有价值。
Salt was a hugely valuable commodity at the time, which experts say could help to explain the huge defensive stone walls which ringed the town.
食盐在那个时代是极贵重的商品，因此，古城四周为何会环绕着坚实的防御性石墙就有了合理的解释。
A village with a castle is naturally much more defensible, but the slot is sacrificed that might have been used for something valuable like a salt mine.
在城堡旁边的村庄自然有更强的防卫能力，但城堡也可能被具有经济价值的盐矿所代替。
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