drilling ['driliŋ]

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n. ��ף�ѵ��������������
v. ��ף�ѵ����drill��ing��ʽ��

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n. boring��oil production

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1. To master drilling technique is very important to drilling workers.
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2. A good way to help you to improve drilling technique is to use a jet bit.
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3. Helical flow in the annular is a common flow pattern in drilling, and it is an important engineering problem for fast and accurate calculating of the flow field and pressure gradient.
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n.
  1. the act of drilling
  2. the act of drilling a hole in the earth in the hope of producing petroleum

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DRILLING
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rotary drilling
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percussive drilling
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percussion drilling
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safe drilling
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