| 摘要 |
A ship includes semi-bottoms that transition into the ship's sides, and a keel that extends downwardly from the semi-bottoms. The keel and semi-bottoms form an equivalent of 120 degree therebetween. Each of the sides is located in the same planar surface with the appropriate semi-bottom, and the height of the keel is equal to or less than the breadth of the semi-bottoms.
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