barter n.物品交换, 实物交易v.物品交换, 交换 commerce n.商业 commodity n.日用品
media n.媒体 convenient adj.便利的, 方便的 impetus n.推动力, 促进
tangible adj.可触摸的,有形的 origin n.起源, 由来, 起因 compensation n.补偿, 赔偿
tribute n.贡金;贡物 exchange vt.交换 precious adj.宝贵的, 贵重的
metal n.金属 mint v.铸造 shell n.贝壳, 壳
primitive adj.原始的, 远古的, 粗糙的, 简单的 cowrie n. 货贝
moulding n.模制, 浇铸 bronze n.青铜, copper n.铜
stamp vt.压制;冲压 crudity n.粗糙;粗陋.原材料, 天然物质
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