Hexavalent chromium is used to plate metals and to make paints, dyes, plastics and inks.
六价铬常作为金属板用于制造涂料、燃料、塑料和墨水。
Metals are opaque so that even the thinnest plate can keep out the light as well as a stone wall.
金属是不透明的，所以甚至最薄的金属板也能像一面石头记墙那样能够阻隔光。
It points out that the pulse discharging between tooth and work pieces on tool plate can make the surface to melt or even vaporize, thus to process the eclipse divided by metals.
工具盘上的轮齿与工件间的脉冲放电可使工件表面熔化甚至汽化，从而达到加工蚀除金属的目的。
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