肋骨线 meaning in English

costal line
frame line

The advantages , such as easily computing form - lines and accurately lofting , are offered by mathematical ship - hull surface . hull structure modeling , engineering analyzing and manufacturing are based on mathematical ship - hull surface . furthermore , hull structure designing in virtual reality environment and intelligent building depend heavily on the ship - hull surface model
船体曲面的数学描述有着很大的优越性，如放样精确，求值(型线、肋骨线、结构线、接缝线等)方便，也是后面船体结构设计，工程分析，建造的依据，是实现智能设计、虚拟建造的先决条件。