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1. Oxford Dictionary

   billion

   • IPA[ˈbɪljən]

   英式

   • card
     the number equivalent to the product of a thousand and a million; 1,000,000,000 or 109；a very large number or amount of something

   • noun: billion, plural noun: billions

2. • 釋義

   card

   card

   • 1. the number equivalent to the product of a thousand and a million; 1,000,000,000 or 109 a world population of nearly 5 billion half a billion dollars
   • ▪ a very large number or amount of something our immune systems are killing billions of germs right now
   • ▪ a billion pounds or dollars the problem persists despite the billions spent on it
   • ▪ a million million (1,000,000,000,000 or 1012).