调查发现PET膜原料上有灰层的翻译：Survey finds gray on the PET film raw materials 什么意思？中文翻译英文，英文翻译中文，怎么说？

青云英语翻译

The survey found pet ash layer on the membrane material

Survey finds gray on the PET film raw materials

The investigation discovered on PET membrane raw material has the ash zone

Investigation has revealed that there is a gray layer PET membrane on raw materials

Survey finds gray on the PET film raw materials