以下为句子列表：
英文: An in-service valve suffering from Dezincification has a white powdery substance or mineral stains on its exterior surface.
中文: 使用中的阀门如果遭遇脱锌侵蚀，会在阀门外表产生白色粉末或矿物污点。
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英文: As a standard NIBCO bronze fire protection valves are made to be “Dezincification Resistant,” which is a seal of quality and longevity.
中文: 作为一种基本要求，美国尼伯科青铜消防阀门都具有“抗失锌”特性，质量更加优异，使用寿命更加长。
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英文: Dezincification of duplex brass, which is a form of corrosion, may occur when in contact with certain aggressive waters.
中文: 两相黄铜的脱锌现象，是一种侵蚀的现象，当接触某种侵蚀性水时可能会发生这种现象。
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英文: Dezincification selectively removes zinc from the alloy, leaving behind a porous, copper-rich structure that has little mechanical strength.
中文: 失锌现象有选择地从合金中将锌排泄出去，使得材料变得多孔、铜含量过大，从而降低材料强度。
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英文: The failure was caused by dezincification corrosion.
中文: 结果表明：凝汽器铜管的腐蚀属栓状脱锌腐蚀。
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