The shape optimization for composite space structures is difficult because these structures usually involve many different types of elements and materials.
由于组合空间结构中单元种类和材料种类较多，导致该类结构的形状优化困难。
The shape optimization for composite space structures is difficult because these structures usually involve many different types of elements and materials.
由于组合空间结构中单元种类和材料种类较多，导致该类结构的形状优化困难。
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