cleaning certificate

• 清管合格证

cleaning certificate的用法和样例：

例句

1. And you'll have to get the yellow paper,of course-I mean a health certificate.
   当然，你还得拿到黄皮书，我是说体检合格证。
2. When a plane has passed all the tests it can get a government certificate of airworthiness.
   飞机经过全部试验合格后，才能获得政府颁发的飞行性能检验合格证。