vt.使尖锐；磨快；加剧
vi.变尖锐
My pencil is blunt, could you lend me a knife to sharpen it? 我的铅笔钝了，你能借我把刀子削一削吗？
Generations of urban living sharpened their wits. 世代居住在城市里使他们磨练了才智。
Strikes will sharpen the country's dilemma. 罢工将加剧这个国家的困境。
用作不及物动词 (vi.)The soldiers sharpened up their knives. 战士们把刀磨得锋利。
Jane voice sharpened as she became impatient. 简变得不耐烦了，声音也变尖了。
n.卷笔刀；研磨者；研磨工具
n.铅笔刀
