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Excavations at tombs from the Eastern Zhou Dynasty (770-256 B.C.) at a construction site in Zhengzhou City, the capital of Central China's Henan Province, April 20, 2017. More than 10 skeletons in strange positions were found in 30 tombs. (Photo: China News Service/Wang Zhongju)

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Excavations at tombs from the Eastern Zhou Dynasty (770-256 B.C.) at a construction site in Zhengzhou City, the capital of Central China's Henan Province, April 20, 2017. More than 10 skeletons in strange positions were found in 30 tombs. (Photo: China News Service/Wang Zhongju)

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Excavations at tombs from the Eastern Zhou Dynasty (770-256 B.C.) at a construction site in Zhengzhou City, the capital of Central China's Henan Province, April 20, 2017. More than 10 skeletons in strange positions were found in 30 tombs. (Photo: China News Service/Wang Zhongju)

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Excavations at tombs from the Eastern Zhou Dynasty (770-256 B.C.) at a construction site in Zhengzhou City, the capital of Central China's Henan Province, April 20, 2017. More than 10 skeletons in strange positions were found in 30 tombs. (Photo: China News Service/Wang Zhongju)

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Excavations at tombs from the Eastern Zhou Dynasty (770-256 B.C.) at a construction site in Zhengzhou City, the capital of Central China's Henan Province, April 20, 2017. More than 10 skeletons in strange positions were found in 30 tombs. (Photo: China News Service/Wang Zhongju)

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Excavations at tombs from the Eastern Zhou Dynasty (770-256 B.C.) at a construction site in Zhengzhou City, the capital of Central China's Henan Province, April 20, 2017. More than 10 skeletons in strange positions were found in 30 tombs. (Photo: China News Service/Wang Zhongju)

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Excavations at tombs from the Eastern Zhou Dynasty (770-256 B.C.) at a construction site in Zhengzhou City, the capital of Central China's Henan Province, April 20, 2017. More than 10 skeletons in strange positions were found in 30 tombs. (Photo: China News Service/Wang Zhongju)

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Excavations at tombs from the Eastern Zhou Dynasty (770-256 B.C.) at a construction site in Zhengzhou City, the capital of Central China's Henan Province, April 20, 2017. More than 10 skeletons in strange positions were found in 30 tombs. (Photo: China News Service/Wang Zhongju)

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Excavations at tombs from the Eastern Zhou Dynasty (770-256 B.C.) at a construction site in Zhengzhou City, the capital of Central China's Henan Province, April 20, 2017. More than 10 skeletons in strange positions were found in 30 tombs. (Photo: China News Service/Wang Zhongju)

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Excavations at tombs from the Eastern Zhou Dynasty (770-256 B.C.) at a construction site in Zhengzhou City, the capital of Central China's Henan Province, April 20, 2017. More than 10 skeletons in strange positions were found in 30 tombs. (Photo: China News Service/Wang Zhongju)