求翻译：由图3和图4可知，拓扑优化结果未出现明显的棋盘格现象，优化迭代过程中，结构体积持续下降，不同的约束条件可以得到相应的优化拓扑结构，表明按本文方法所编程序对于三维结构和对流边界条件也具有较好的适用性。是什么意思？

Figure 3 and Figure 4 shows the topology optimization results do not appear obvious checkerboard, optimize the iterative process, structure, volume continued to decline, different constraints can obtain the corresponding optimized topology, indicating that this method programmed three-dimensional Th

From Figure 3 and figure 4 suggests, the topology optimization results do not appear obvious chess phenomenon, optimization iterative process, the structure size continued to decline, and different conditions can be optimized topology, indicated by this method for the 3D structure and convective bou

And Figure 4 may know by Figure 3, the topology optimization result has not appeared obviously checks the phenomenon, in the optimization iterative process, the structure volume drops continually, the different constraint condition may obtain the corresponding optimization topology, indicated arrang

Figure 3 and Figure 4, topology optimization results and there is no obvious phenomenon of checkerboard, optimizing the iterative process, structured volume continues to fall, corresponding to the different constraint conditions can get optimal topology, indicating that this article prepared by the

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