plumbago [plʌm'beɪgoʊ]

例句:

• Tessa explores the abandoned mine workings to find the long-forgotten source of plumbago.
  来自BBC
• Any of various plants of the genus Plumbago; leadwort .
  任何石墨属 白花 丹科的植物.
  
• The secret ingredient was a mysterious and rare mineral called plumbago.
  来自BBC
• Yards are gaudy with plumbago, the circular driveways enclosed by wrought-iron fences.
  来自NEWYORKER