sentences: bark is a protective covering around the trunk of / branches of a tree
docs: winter's_bark is bark. tree has bark_around_outside_of tree_bark is plant_part. tree_bark is external_anatomical_part. tree_bark is protective_system. cinnamon_bark is bark. cascarilla_bark is bark. winter's_bark is tree. bark is hard_covering_for_tree. bark is covering.