a sharp knife

• You need a sharp knife to cut through the knot .
  你需用快刀才能把结切断。
• She pared the apple with a sharp knife .
  她用锋利的刀削苹果。
• She pared the apple with a sharp knife .
  她用快刀削苹果。
• The secret is a sharp knife and a firm hand .
  诀窍就是得有一把快刀，和一只果断的手。
• A sharp knife makes a clean cut .
  快刀切得整齐。
• He cut a notch in the stick with a sharp knife
  他用一把利刀在手杖上刻了个凹槽。
• She pare off the thick peel with a sharp knife
  她用一把锋利的刀削去厚厚的果皮。
• The chief chef chopped the tough beef with a sharp knife
  大厨师用利刃剁韧牛肉。
• She pared off the thick peel with a sharp knife
  她用一把锋利的刀削去厚厚的果皮
• You need a sharp knife to cut through the knot
  你需用快刀才能把结切断