椅

In a sentence

• 这是一张椅子。

  This is a chair.

  The word '椅子' refers to a chair, explicitly defining an object in this sentence.

• 桌子旁边有一张椅子。

  There is a chair next to the table.

  Here, '椅子' is used to describe the location of the chair relative to another object, the table.

• 请你把那张椅子搬过来。

  Please move that chair over.

  In this example, '椅子' is utilized to refer to the specific chair being requested to move, showing its application in instructions.