sharpenvt.使尖锐；磨快；加剧vi.变尖锐sharpened slate pencil削尖石笔sharpen your knife forvt.准备惩罚Sharpen your pencil.削铅笔。sharpening enhancement锐化增强sharpen a kitchen knife钢菜刀sharpen with a strap.用磨刀皮带使变得尖锐。sharpen their knife forvt.准备惩罚sharpen one's knife for吉尔德布兰特Sharpen the pitchforks.把干草叉磨尖？sharpening of round angle圆角变尖

1. The soldiers sharpened up their knives.
   战士们把刀磨得锋利。