As stress builds up in the crust right before an earthquake, microfractures allow these gases to escape to the surface.
地震前,随着压力在地壳中变大,这些气体可以通过微小的裂缝溢出地表。
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To a technique called microfracture, where surgeons create small holes in the bone, allowing bone marrow stem cells to leak out and form new cartilage.
Fracture mechanics is the field of mechanics concerned with the study of the propagation of cracks in materials. It uses methods of analytical solid mechanics to calculate the driving force on a crack and those of experimental solid mechanics to characterize the material's resistance to fracture.