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Archaeologists work at the No. 3 Horse and Chariot Pit, one of a cluster of tombs belonging to noble families of the Zheng State, a vassal state during the Spring and Autumn (770-476 B.C) and Warring States periods (475-221 B.C), near the city of Xinzheng in central China's Henan Province, Nov. 13, 2017. Since February, four chariots and 122 horse skeletons have been found from the 2,400-year-old pit, the largest of the three within the cluster that have been excavated so far. (Xinhua/Zhu Xiang)

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An archaeologist works at the No. 3 Horse and Chariot Pit, one of a cluster of tombs belonging to noble families of the Zheng State, a vassal state during the Spring and Autumn (770-476 B.C) and Warring States periods (475-221 B.C), near the city of Xinzheng in central China's Henan Province, Nov. 13, 2017. Since February, four chariots and 122 horse skeletons have been found from the 2,400-year-old pit, the largest of the three within the cluster that have been excavated so far. (Xinhua/Zhu Xiang)

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Archaeologists work at the No. 3 Horse and Chariot Pit, one of a cluster of tombs belonging to noble families of the Zheng State, a vassal state during the Spring and Autumn (770-476 B.C) and Warring States periods (475-221 B.C), near the city of Xinzheng in central China's Henan Province, Nov. 13, 2017. Since February, four chariots and 122 horse skeletons have been found from the 2,400-year-old pit, the largest of the three within the cluster that have been excavated so far. (Xinhua/Zhu Xiang)

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An archaeologist works at the No. 3 Horse and Chariot Pit, one of a cluster of tombs belonging to noble families of the Zheng State, a vassal state during the Spring and Autumn (770-476 B.C) and Warring States periods (475-221 B.C), near the city of Xinzheng in central China's Henan Province, Nov. 13, 2017. Since February, four chariots and 122 horse skeletons have been found from the 2,400-year-old pit, the largest of the three within the cluster that have been excavated so far. (Xinhua/Zhu Xiang)

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The No. 3 Horse and Chariot Pit, one of a cluster of tombs belonging to noble families of the Zheng State, a vassal state during the Spring and Autumn (770-476 B.C) and Warring States periods (475-221 B.C), is seen near the city of Xinzheng in central China's Henan Province, Nov. 13, 2017. Since February, four chariots and 122 horse skeletons have been found from the 2,400-year-old pit, the largest of the three within the cluster that have been excavated so far. (Xinhua/Zhu Xiang)

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Archaeologists work at the No. 3 Horse and Chariot Pit, one of a cluster of tombs belonging to noble families of the Zheng State, a vassal state during the Spring and Autumn (770-476 B.C) and Warring States periods (475-221 B.C), near the city of Xinzheng in central China's Henan Province, Nov. 13, 2017. Since February, four chariots and 122 horse skeletons have been found from the 2,400-year-old pit, the largest of the three within the cluster that have been excavated so far. (Xinhua/Zhu Xiang)

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An archaeologist works at the No. 3 Horse and Chariot Pit, one of a cluster of tombs belonging to noble families of the Zheng State, a vassal state during the Spring and Autumn (770-476 B.C) and Warring States periods (475-221 B.C), near the city of Xinzheng in central China's Henan Province, Nov. 13, 2017. Since February, four chariots and 122 horse skeletons have been found from the 2,400-year-old pit, the largest of the three within the cluster that have been excavated so far. (Xinhua/Zhu Xiang)

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An archaeologist works at the No. 3 Horse and Chariot Pit, one of a cluster of tombs belonging to noble families of the Zheng State, a vassal state during the Spring and Autumn (770-476 B.C) and Warring States periods (475-221 B.C), near the city of Xinzheng in central China's Henan Province, Nov. 13, 2017. Since February, four chariots and 122 horse skeletons have been found from the 2,400-year-old pit, the largest of the three within the cluster that have been excavated so far. (Xinhua/Zhu Xiang)