The flow of water over the underwaterhull portions creates a hydrodynamic force.
水流的水下船体部分创建了一个水动力。
2
In this stage, the lifting frame was fixed to a hook attached to a crane, and the hull was lifted completely clear of the seabed and transferred underwater into the lifting cradle.
在这一阶段，吊架固定在吊车的挂钩上，船体完全脱离海床，在水下被转移到吊篮里。
3
Each hull of its catamarans has an underwater duct which serves two functions (see illustration).