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blue stone, blue vitriol, blue whale, blue-and-white, blueback, Bluebeard, bluebell, blueberry, bluebill, bluebird,

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障碍问题, 障碍物, 障板, 障蔽, 障蔽物, 障壁, 障壁坝, 障壁岛, 障壁后沉积, 障眼法,