求翻译：set to 200 m. The overburden is split into 5 layers, labeled OB1 to OB5 from top to bottom. Similarly, the underburden is split into是什么意思？

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set to 200 m. The overburden is split into 5 layers, labeled OB1 to OB5 from top to bottom. Similarly, the underburden is split into

问题补充：

匿名	2013-05-23 12:21:38

匿名	2013-05-23 12:23:18

匿名	2013-05-23 12:24:58

匿名	2013-05-23 12:26:38

匿名	2013-05-23 12:28:18

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