概述了小槽孔的设计公式以及钻孔的注意事项。
In this article, it remarks the design formulary and the notice of small slot.
通过钻孔冲击物理试验，研究了钻孔冲击的临界压力，以及钻孔冲击的条件；
The critical pressure and conditions of drilling hole burst are determined through the physics experiment of drilling hole burst.
很难去设想外界会提供免费或肥料补贴以及钻孔设备给每个需要它们的非洲村落。
It's hard to imagine the outside world providing free or subsidized fertilizer and boreholes to every African village that needs them.
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