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When professor an was telling the story of the old civilization, he suddenly heard this term.
He frowned slightly, finding it hard to understand.
“Is it hard to understand?”
Professor an looked at Lu Xin and smiled bitterly, “”I, as well as many people at that time, probably found it difficult to understand.”
but the person who proposed this theory at the time was very firm.
“They said that this sign has been running through human history for a lon ...
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