他们用的是10以前的材质和工艺的翻译：They are 10 previous material and technology 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

They use materials and processes in the previous 10

They are 10 previous material and technology

They use are 10 beforehand material qualities and the craft

They used the previous 10 in materials and workmanship

They are 10 previous material and technology