当使用不同变量加深对一个区间的理解时，我们称之为深度划分。
When numerous variables are combined to give an in-depth understanding of a segment, this is referred to as depth segmentation .
将传统设计方法与改进设计方法结合，并将两个设计结果进行比较，给出每层套管的合理下入深度区间。
Traditional design methods and design methods to improve integration of the two design and comparison of results are given every reasonable under the casing depth interval.
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