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Resin extraction : ウィキペディア英語版 | Resin extraction
Resin extraction consists of incising the outer layers of a pine tree in order to collect the sap or resin. ==Summary== Resin circulates throughout a coniferous tree, and serves to seal damage to the tree. Harvesting pine resin dates back to Gallo-Roman times in Gascony. Tapping pines may either be done so as to sustain the life of the tree, or exhaustively in the years before the tree is cut down.
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