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  1. Oxford American Dictionary

    sight glass

    • IPA[sīt ɡlas]
    • n.
      a transparent tube or window through which the level of liquid in a reservoir or supply line can be checked visually.

    • noun: sight glass, plural noun: sight glasses

    • 更多解釋

    sight glass

    • n.
      a transparent tube or window through which the level of liquid in a reservoir or supply line ...

    Oxford Dictionary