然而，其设计与计算方法仍然是一个亟待深入研究的课题。
However, the design and calculating methods of this technique need more attention and urgent research work.
然而，其设计与计算方法仍然是一个亟待作深入研究的课题。
However, the design and calculating method of it need more attention and urgent research works.
本文主要研究了导管架海洋平台结构系统优化设计的理论与数值计算方法。
The theoretical and numerical methods of structural design optimization for offshore platforms are studied in this thesis.
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