Pretreatment business is an assistant industry of the national economy, it is the necessary technics for many manufacturing.

表面处理产业是国民经济众多工业领域中的辅助产业，表面处理是许多制造工业必需的工艺。

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These differences may come from the difference of assistant materials and manufacturing process.

这种差异可能来自于添加的辅料不完全相同，或者生产工艺上的不同。

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He is Assistant to the President for Manufacturing Policy.

WHITEHOUSE: Press Briefing

Jim Neill was known for humor and occasional profanity in his previous job as an assistant vice president of a Washington manufacturing industry group.

WSJ: To Colleagues: I'm Outta Here