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geotropic adj.向地性的。adv.-ally

geotropism

Pneumatophore ( aerophore ; breathing root ) a specialized negatively geotropic root produced by certain aquatic vascular plants ( especially trees such as mangroves , e . g 呼吸根:指由某種水生維管植物產生的特化的負向地性根(尤其如紅樹,如海桑屬) ,在土壤之上生長良好。