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prehistoric

美国发音:[.pri'hɪstɔrɪk]
英国发音:[.priːhɪ'stɒrɪk]

[adj]
英语解释:relating to the period of time before history was first written down
常见翻译:史前的,(有记载的)历史以前的

The 'seed' itself might be the tooth of a prehistoric shark.
这颗“种子”本身也许是一只史前鲨鱼的牙齿。