This paper introduces the 'structure characteristics and rock fragment characteristics of single step drill head with point pick.

介绍了单阶梯尖环齿钻头的结构特点及碎岩特点。

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"We now have a high volume process for manufacturing sodium fill valves," said Schaefer. "We drill the holes, fill them with sodium and seal them all in one step."

“我们现在拥有了一种高集成的中空充钠气门生产工艺，”Schaefer说，“钻孔填钠密封，一步就可以搞定。”

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In general can be twist drill hole, but you should drill holes, step and then expanded to the required diameter.

用一般的麻花钻即可开孔，但应先钻小孔，然后步扩大到所需直径。

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Step one is to drill and step two is to drill.

WHITEHOUSE: President Obama at the University of Miami

There are some who say we should have -- as the President alluded to yesterday -- a three-step approach to dealing with oil prices in this country, which is -- step one is we should drill, the second step is that we should drill some more, and the third step is that we should keep drilling.

WHITEHOUSE: Press Briefing by Deputy Press Secretary Josh Earnest

And you know what the essence of their plan is going to be, which is: Step one, drill.

WHITEHOUSE: President Obama Speaks on American Energy