be made of和be made from都表示“由……制成”，但be made of强调原材料的本身的物质构成，而be made from侧重于强调原材料的来源和制作过程。例如，chair is made of wood，强调的是椅子是由木材制成；而paper is made from wood pulp，强调的是纸张是由木浆制成。