Top-down mining 自顶向下挖掘
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。
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。
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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