三滤是长期以来形成的一个行业内代名词；它代表了三种常用的汽车配件，即机油滤清器、燃油滤清器、空气滤清器。它们分别担负润滑系统、燃烧系统和发动机进气系统中介质的过滤。 由于通常车主在进行汽车保养维修时需要同时检修或更换这三种配件，故此在形成了三滤这样一个代名词。
阐述了管井井点排水的设计布置及井点钻孔质量、三滤质量、洗井质量、抽水连续性等关键工序的施工技术。
The design layout, key process of construction, such as well point drilling quality, filtrating quality, well washing quality, continuity of pumping were discussed.
然后将三个图像洗出，分别用三个加了与初始滤片相同的滤片的投影仪投影在屏幕上。
The three images were then developed and projected onto a screen with three projectors using the same color filters as the initial cameras.
在这个报告里，我尽可能详细地提供有关这三个滤碗的细节。首先介绍一下历史情况。
In this report I'll try to provide as much detail as possible about these filter baskets. First, some history.
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