They may be useful in identifying edge cases and for determining that a product is functionally complete, but they should be deployed only in the later stages of design validation. 用例可能在确定边缘情况，以及确定产品在功能上是否完整方面非常有用，但它们只适合在设计验证的后期采用。
Therefore, the structure optimization used in the light-weight design can determine the shape of the cylinder block easily and decrease the repetitions of design and validation. 结构优化方法用于缸体的等强度轻量化设计中，很容易确定缸体的最佳形状，并能减少重复设计验证的次数。
