economic upgrades of various gathering tools.
unlock:market
allows trading of resources for gold and the purchasing of resources with gold wealth.
解鎖：市場
解鎖市場建造，市場將可與許玩家以黃金買賣食物、木材、石頭資源。
每次購買資源將消耗越來越多黃金；反之販售越多資源將逐漸拉低販售價格。
unlock:oil cart
a horse drawn cart that can lay oil slicks for town or army defence. it provides a limited amount of oil slicks and can pick up oil slicks previously laid. oil slicks can be set afire by dragons/archers/siege gear from either battle participant.
解鎖：燃油車
一輛可為城鎮或軍隊防禦鋪設燃油的馬車。 可在移動路徑上鋪設或是回收燃油。 燃油可由龍/弓兵火箭/攻城投石機火彈點燃。
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