thin porous streak
... thin out 尖灭 thin porous streak 孔隙性薄层 thin sand 薄砂层 ...
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钢铁件上薄层亮镍的高孔隙率必然带来低的抗蚀性。
The corrosion resistance of high porosity is very low on the thin bright nickel plating for steel and iron works.
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