pào zhào
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  • n.bubble cap; bell cap

    • zài fú fá tǎ bǎn zhōng tǎ bǎn kǒng shang fù gài yǒu kě xiān shì pào zhào

      浮阀塔板塔板覆盖泡罩

      In valve trays, perforations are covered by liftable caps.