| 摘要 |
The hull of a boat includes an opening which is closed by a door attached to the hull with a hinge and capable of limited pivoting motion on the hinge with a substantially horizontal axis of the pivot. In its upright first extreme position the door comprises a part of the hull. In a second folded down extreme position the door is substantially parallel with the water surface and can act as a loading platform and also as a stabilizer against wave action in rough waters.
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