flick knife

例句：

1. 1. She flicked the knife against the wall to sharpen it.
   她用刀在墙上轻弹以磨利它。
2. 2. The chef flicked his knife over the steak to create a crispy crust.
   厨师用刀在牛排上轻弹，以形成脆皮。
3. 3.He flicked his finger at the audience, drawing their attention.
   他用手指轻弹观众，引起他们的注意。