船舶的航线确定了船舶航行的具体方向、起讫点和经停点，以维护海上交通秩序，保证航行安全。
The route of the ship determined the navigation concrete directions, port of point and stops, in order to maintain point maritime traffic order, and guarantee a safe sailing.
不同的航速、海情以及不同的航行方向使得船舶横向运动的水动力参数模型发生很大的变化。
The hydrodynamic coefficients of ship's vertical motion change a lot in different sea environment and ship sailing condition.
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