A gradual agricultural revolution in northern Europe stemmed from concerns over food supplies at a time of rising populations.
北欧渐进的农业革命源于人口增长时期对粮食供应的担忧。
A gradual agricultural revolution in northern Europe stemmed from concerns over food supplies at a time of rising populations.
北欧渐进的农业革命源于人口增长时期对粮食供应的担忧。
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