For many decades, even after being exposed to the elements, zinc galvanizing has protected your steel heating and cooling ducts.
镀锌表皮暴露在自然环境中，但它几十年来还是很好地保护了负责加热或冷却的钢制管道。
For many decades, even after being exposed to the elements, zinc galvanizing has protected your steel heating and cooling ducts.
镀锌表皮暴露在自然环境中，但它几十年来还是很好地保护了负责加热或冷却的钢制管道。
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