And then a concept of critical intrinsic zone of crack propagation is introduced, crack propagation happens when the tress or strain status of the zone reaches to the material critical rupture value.

认为裂纹顶端存在一个决定裂纹扩展本征区，裂纹扩展是因为本征区的应力应变状态或损伤状态达到材料的断裂韧性才发生的。

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So intrinsic system must be broken and forestry micro-foundation of the state-owned forest zone must be reconstructed.

为此，必须打破原有体制，对国有林区林业微观基础进行重构。

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These were value investors who refused to blanch at losses just so long as they believed the banks and the American International Group they owned remained in a zone of intrinsic value.

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