sharply

例句：

1. 1.He sharped his knife on the stone to cut the vegetables.
   他用刀在石头上磨利，以便切蔬菜。
2. 2.The sharp edge of the knife cuts through the tough material easily.
   这把刀的锐利边缘很容易就割破了坚韧的材料。
3. 3. She sharped her voice for the audience to hear clearly.
   她提高了声音，以便观众能清楚地听到。