| 摘要 |
A semi-submersible vessel comprising at least one hollow toroidal element adapted to float with its plane upright having an exposed upper portion carrying a working platform. The toroidal element preferably is formed by describing a circular or elliptical locus with the center of a circular or elliptical generating figure, the size of the generating figure being larger at the bottom than at the top of the floating toroidal element.
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