Artifacts are formed from metal, such as an Arrowhead from an ancient Mayan civilization, or a Metal Sword from Medieval Europe.

后生物由金属构成，就像古玛雅文明的箭头或中世纪欧洲的剑。

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Arabic civilization and Byzantium civilization had their glory during Medieval times, and had long deep influence in world history.

阿拉伯文明和拜占廷文明在中世纪呈放光彩，对世界历史产生过深远影响。

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Modern contract civilization originated from medieval contract civilization, which embodied many obvious characteristics. At that time, There were lots of contracts, such as charters, city-laws.

中古城市契约文明是近代契约文明的直接源头，但带有明显的过渡性特征。

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Skeptics believe that temperatures will rise due to CO2, but will remain within the bounds of temperatures we have already seen over the last millenia, including those in the Medieval Warm Period during which European civilization thrived.

FORBES: Bait and Switch in the Climate Debate