Suitable for medium hard formation.

适应于中等硬度地层。

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A new synthetic diamond impregnated matrix for drill bit used in hard formation is designed.

针对软硬交错、研磨性高的地层设计了一种新型人造金刚石混合孕镶块。

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Failure accident are liable to occur in the deep well and hard formation. Fatigue faliure is the main faliure form.

特别是在深井作业中及硬地层，容易发生失效事故，其中疲劳失效是主要的失效形式。

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Chevron, for example, has invested heavily in shale production in the Marcellus field in Pennsylvania, while ConocoPhillips has been working hard at the Eagle Ford formation in Texas.

FORBES: The Shale Scramble: Exxon Buying Bakken Assets For $1.6B From Denbury

In particular, taxes should not: discourage hard work and risk taking, impede capital formation, impose high costs for computation and enforcement, favor particular groups or activities, or intrude on individual liberty any more than is absolutely necessary.

FORBES: Spending Is Choking Us And Tax Cuts Are No Heimlich Maneuver

Under snowy skies this week, inmates marched onto the frozen lake in military formation in winter-weight prison greens and hard hats.

WSJ: NY inmates help build ice palace in Adirondacks