钻探垂直孔。

Drilling vertical holes.

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在所有具有垂直落差的瀑布中，最大流量的瀑布为45英尺、每秒钟溢出250万加仑湄公河水的孔恩瀑布（Khone Falls），它位于老挝和柬埔寨之间的边境上。

Of waterfalls that do include a vertical drop, the waterfall with the greatest volume is the 45-foot Khone Falls, on the border between Laos and Cambodia.

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立式铣床主轴与工作台面的垂直度会影响孔的圆柱度。

The verticality of vertical milling machine spindle and the worktable can affect hole cylindricity.

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