Comparing with presented top-down mining algorithms, the experiments indicate that it is fast and efficient.

实验证明，与现有的自顶向下挖掘算法相比，该算法是快速而有效的。

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Data mining can combine top-down analysis techniques with bottom-up analysis techniques.

数据挖掘结合自顶向下分析技巧和自底向上分析技巧。

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When vertical column is lifted, the roof beam is closely near top plate, the integrated mining equipment can be lifted or laid down by the hoisting jack.

当立柱升起后顶梁贴紧顶板，提升千斤就能提起或放下综采设备。

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