Sharp's the word.

例句：

1. 1.The sharp knife cuts through the tough material easily.
   这把锋利的刀很容易切穿这种坚韧的材料。
2. 2. He has a keen eye for detail and is very sharp in his work.
   他对细节非常敏感，工作非常出色。
3. 3.The sharp edge of the knife was causing her pain.
   这把刀锋利的边缘让她感到疼痛。