sharpened

v.

（使）提高( sharpen的过去式和过去分词 )；（使声音）变得尖锐；（使）变得更好（或技术更高、更有效等）；（使）变得锋利

sharpen up使……更敏锐；认真思考

1. Thus the fracture likely initiated from fatigue sharpened cracks originating from slag and void in the plug welds.
   因此，断裂可能是由于从塞焊焊缝内的焊渣和气孔外形成的尖锐的疲劳裂纹而产生的。

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