刀

刀

Knife.

The word '刀' refers to a physical object, specifically a sharp-edged tool used for cutting.

这是一把非常锋利的刀。

This is a very sharp knife.

Here, '刀' is used to denote the tool used in the action described, emphasizing its function.

他用刀切菜，非常熟练。

He uses a knife to cut vegetables skillfully.

In this sentence, '刀' specifies a type of tool with a specialized purpose, namely a carving knife.

雕刻需要一把精致的雕刻刀。

Carving requires a delicate carving knife.