Longitudinal crack of drill pipe box joint is brittle fracture at low stress.

钻杆接头的各种纵向开裂属于低应力脆性断裂。

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This makes the bone become very brittle and easier to fracture.

这使得整体骨骼变得非常脆弱，而且容易骨折。

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This makes the bone become very brittle and easier to fracture.

这使得整体骨骼变得非常脆弱，而且容易骨折。

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