protective filter

英 美
  • 防护滤层
  • filter n.过滤器;滤色镜;滤光器v.过滤;渗透
  • protective adj.保护的;防卫的
    1. The chimney is no longer giving off volumes of waste gas into the atmosphere, as protective filters are being used.
      加装了防护过滤器以后,这烟囟已不再散发成股的废气到大气中去了。