毛细裂纹 capillary crack; capillary fi ure; capillary fissure; chap; hair cracks; hairl ..
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The cutting should be so precise and smooth that even a thread of hair cannot slip through the cracks.
削木需要非常精准和平滑，甚至一根头发丝的缝隙都不能有。
The distortion deformation during diameter reduction not only changes the primary defects (such as hair-line seams) into screwy form, but also enlarges the primary cracks.
而减径变形中的扭转变形不但使原始缺陷形成螺旋状，同时还进一步扩展了裂纹。
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