куски

In a sentence

• Я нарезал хлеб на куски.

  I cut the bread into pieces.

  Here 'куски' means 'pieces', referring to portions of bread split by cutting.

• Куски мяса были слишком большими для сковороды.

  The pieces of meat were too large for the pan.

  In this sentence, 'куски' is used to indicate portions or chunks of meat.

• Он взял куски картона и начал строить модель.

  He took pieces of cardboard and started building a model.

  Here, 'куски' signifies sections or portions of cardboard used for construction.