動(dòng)詞 sharpen:

1. make sharp or sharper
2. make sharp or sharper
3. become sharp or sharper
4. put (an image) into focus
   同義詞：focus, focalize, focalise
5. make (images or sounds) sharp or sharper
6. raise the pitch of (musical notes)
7. give a point to
   同義詞：taper, point
8. make (one's senses) more acute
   同義詞：heighten

1. My pencil is blunt, could you lend me a knife to sharpen it?
   我的鉛筆鈍了，你能借我把刀子削一削嗎？
2. The soldiers sharpened up their knives.
   戰(zhàn)士們把刀磨得鋒利。
3. Generations of urban living sharpened their wits.
   世代居住在城市里使他們磨練了才智。