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the dash size dash 如何翻译?

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the dash size dash 如何翻译?
求前后语境
再问: 是一个机械行业标准上的,主要讲的是管接头,the dash size for(1) is the largest male face seal end of ends(1) (2) and(3).
再答: http://forum.wordreference.com/showthread.php?t=1849019 无语了,外国人也不知道。。 找到老, In the automotive world, hose size is expressed by inside diameter. For example, a 3/8 inch has has a nominal (approximate) inside diameter (ID) of 3/8 inch. Not so with aircraft hose. Aircraft hose uses dash numbers to designate the hose size. Dash size is in 1/16 of an inch. So -2  (2/16) 1/8 inch, -6  (6/16) 3/8 inch, -8  (8/16) 1/2 inch and so on. 意思就是 dash 其实就是表示那个 波折号,代替 hose size,气管内径 !!!!!