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Overseas super-large sweeping robots, specially used to clean up pig manure, are much more efficient than manual ones. -
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No laughing or crying, there is a fake old Beijing snack in Beijing Snack Street. Businessmen do it in old Beijing. -
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Workers dug up mysterious mines and 200 Shredons were seen again. Experts: at least 5 billion -
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"June 1st" International Children's Day Paradise, Labor People's Cultural Palace -
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India's largest "human flesh laundry" uses muddy sewage to wash clothes. Why not use a washing machine? -
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Three children out of danger of life, the lowest need not amputation -
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"All Good" Xiaomi and Su Daqiang share the same frame again. -
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Ancient "King of Poisons" Hedinghong, what is it? We all have access to it.
Home >Anecdote > Why are birds' nests open to the sky?
Why are birds' nests open to the sky?
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