Pure elastic fracture is always rare, so th at under the action of stress, a plastic zone(large or small), and interactions between crack and dislocations always exist at the crack tip.

纯弹性断裂总是极少的，因之在加载应力作用下，裂纹顶端总是存在着或大或小的塑性区，存在着裂纹与位错的交互作用。

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There are some streamline microstructures and a slight grain melting in the heat affected zone on the side of pure copper.

接头紫铜一侧热影响区出现明显的须状组织，并有晶粒微溶的迹象。

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During extensional activities of Late Cretaceo us to Eogene, intense upwelling of asthenosphere happened under the fault zone, leading to lithospheric necking in pure shear mode1.

断裂带在晚白垩世-早第三纪的伸展活动中，软流圈进行了强烈的上隆，岩石圈出现了显著的细颈化，属于纯剪切伸展模式。

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In short, Steam trades are not always pure exchanges happening in some moral-free zone where social obligations are perceived to be non-existent.

FORBES: Virtual World Needs Laissez-faire Economists