添加一个ORDER SIBLINGS BY子句，该子句只能与分级查询子句组合使用，并且将按预先定义的顺序返回同级查询结果。
Adding an ORDER siblings BY clause which is only allowed in composition with the hierarchical query clause and will return the siblings in the predefined sequence.
对深孔钻屑组合机床分级进给机构进行改进后，达到了简化结构、方便调整、减少故障的目的。
After the modification of step feed mechanism of deep drill combined machine tool, simplifying structure, convenient adjustment and reducing fault rate have been proved.
通过与并行寻优、线性组合方法的比较，得出了分级优化法具有灵活性及收敛性好等特点的结论。
The conclusion is that, compared with the parallel-searching and the linear combination methods, the sectional optimization method is more flexible and better in convergence.
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