A fluid is a substance that deforms continuously when subjected to a shear stress, no matter how small that shear stress may be.
无论受到多么小的剪切力都会发生连续变形的物质叫做流体。
When the shear band spacing reaches the critical value, shear cracks occur and continuously extend, finally resulting in the fracture failure.
当间距减小到一定值时产生剪切裂纹并不断扩展，最终导致断裂破坏。
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