That bag is made of recycled materials.

那个包是由回收材料制成的。

同一单元的其他句子

• These shirts are made of cotton.这些衬衫是由棉花制成的。
• What is that sweater made of?那件毛衣是由什么制成的？
• The silk blouse feels very soft.这件丝绸衬衫摸起来很柔软。
• Are these jeans made of denim?这些牛仔裤是牛仔布做的吗？
• This scarf is not made of wool.这条围巾不是羊毛做的。