铜和锡锭是制作金属的原材料，它们被磨成小球型可以便于运输，而那个时代也因金属而得名。
Shaped into pellets convenient for shipping, copper and tin ingots were the raw material for making the metal which defines the Bronze Age.
铜和锡锭是制作金属的原材料，它们被磨成小球型可以便于运输，而那个时代也因金属而得名。
Shaped into pellets convenient for shipping, copper and tin ingots were the raw material for making the metal which defines the Bronze Age.
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