Compared with shape and size optimization, it is considered as the most difficult and challenging problem.

与形状优化和尺寸优化相比较，拓扑优化的难度最大，也最具有挑战性。

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Compared with shape and size optimization, it is considered as the most difficult and challenging problem.

与形状优化和尺寸优化相比较，拓扑优化的难度最大，也最具有挑战性。

youdao