翻译练习（二）？ 关于mesh size，这是个专有词，我以前碰到包括我今天查到的都是指目数。 http:///wiki/mesh_size tyler mesh size one well-known mesh series is the tyler equivalent created by the w.s. tyler screening company [1] . tyler mesh size indicates exactly the number of openings per square inch of mesh. for instance, a tyler number 4 mesh will have 4 openings per square inch, and 16 means it will have 16 openings per square inch. to calculate the size of the openings in a mesh the thickness of the wires making up the mesh material must be taken into account. in practice, mesh openings are determined referring to a chart like the one below. http:///experimental/meshmicron.htm what does mesh size mean? figuring out mesh sizes is simple. all you do is count the number of openings in one inch of screen (in the united states, anyway.) the number of openings is the mesh size. so a 4 mesh screen means there are four little squares across one linear inch of screen. a 100 mesh screen has 100 openings, and so on. note, therefore that as the number describing the mesh size increases, the size of the particles decreases. higher numbers = finer powder. mesh size is not a precise measurement of particle size. screens can be made with different thicknesses of wire. the thicker the wires, the smaller the particle passing through that screen, and vice versa. http:///fireworks/making-fireworks-projects/screen-mesh-metal-particle-size.asp http:///lang/en/media/pdf/flyers/meshsize.pdf http:///meshsizecoverter.aspx 查看更多
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