impurity guard sleeve

例句：

1. 1.The engineer designed a purity guard sleeve to protect the machine from dust and debris.
   工程师设计了一个纯度保护套，以保护机器免受灰尘和碎片的侵害。
2. 2. The company's new product is an impurity guard sleeve that can effectively prevent bacteria growth.
   该公司的新产品是一种纯度保护套，能有效阻止细菌生长。
3. 3. The purity guard sleeve was made of high-quality materials and had a tight fit around the joint.
   纯度保护套由高质量的材料制成，紧密贴合关节处。