... 氮素海鸟粪 guano nitrogen 秘鲁海鸟粪 Peruvian guano 磷质海鸟粪 Phosphatic guano ...
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guano o nitrogen 氮素海鸟粪
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Between 1840 and 1880, guano nitrogen made a vast difference to European agriculture.
ECONOMIST: The story of man's staple food
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