求翻译：适当的细粉 (是什么意思？

Appropriate powder (<40μm) can improve the flow of content quality, reduce losses and improve catalyst regeneration efficiency, in coarse powder particles from the lubricant, a catalyst to improve the flow properties

Appropriate powder ( <40 µm) content can improve flow of wear and tear and improve quality, reduce catalyst regeneration efficiency, powder in rough particles from between the lubricating role as a catalyst to improve the flow of performance

The suitable fine dust (<40μm) the content may improve the fluidization quality, reduced the catalyst loss and the enhancement regeneration efficiency, the fine dust got up the lubrication between the coarse particles, improved the catalyst fluidization performance

Appropriate fine powders (< 40 μ m) content can improve the flow of quality, reduce catalyst losses and increase recycling efficiency, fine between coarse particles in lubrication, improved performance of fluidized catalyst

Appropriate detailed powder (40μ m), content can improve flow quality of taking, reduce catalyst loss and raise the regenerated efficiency, the thin powder has played a lubricated role among thick particle, the performance of melting that have improved catalysts and flowed