sharpening/ˈʃɑːr.pən/动词使变尖；使锋利My pencil is blunt - I'll have to sharpen it.我的铅笔钝了——我得削一下。加强；加剧I went to university to sharpen my mind.我上大学是为了让自己的头脑更加敏锐。使清晰；使清楚How do you sharpen the focus on this camera?这台相机的焦距怎么调清楚呢？想跟读，去练习
