名词是sharpness，意思是锐利，敏锐度，例如：
1、There was a sudden sharpness in her voice.她的嗓音突然抬高了。
2、Study on Adaptive Resonance Theory Based Wheel Sharpness in Grinding Process.基于自适应共振理论的磨削过程砂轮锋利度识别研究
3、We proposed a quality measurements based on sharpness function.提出了基于锐度函数的质量评价算法。
