以下为句子列表：
英文: A movable keel in a sailboat that can be pivoted upward to reduce the boat's draft in shallow water.
中文: 活动防浪板帆船上一活动龙骨，可以绕枢轴扯起以减少船在浅水的吃水深度
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英文: A riverboat with a keel but without sails, used for carrying freight.
中文: 运货船一种运货的河流用船，有龙骨但无帆
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英文: A ship shall be deemed to have been constructed on the date when its keel is laid or when it is at a similar stage of contruction.
中文: 一艘船舶应被视为建造于其龙骨铺设之日或当其处于类似建造阶段之日。
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英文: A tall vertical spar, sometimes sectioned, that rises from the keel or deck of a sailing vessel to support the sails and running rigging.
中文: 船桅，桅杆一条高的（有时为分段的）垂直樯，从帆船的龙骨或甲板直立起来以支持帆和操纵装置
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英文: Based on the advantage of former keel stairs,this stairs adopt new extrusion craftwork;and the structure of the stairs are more firm and safe.This product has been awarded many national patents.
中文: 该楼梯在保持原有龙骨楼梯优点的基础上，采用了新的挤压枝术工艺，使楼梯的结构更加的坚固、安全，该产品曾荣获多项国家专利。
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