B2 the number 1,000,000,000十亿
UK old-fashioned 1,000,000,000,000一万亿
a very large number(数目)非常多
More examples
Japan exported $117 billion in merchandise to the US in 1999.
8 billion has been wiped off share prices worldwide.
In China, the policy of one child per family was introduced to stabilize the country's population at 1.6 billion.
The Clinton administration last winter assembled the $50 billion emergency bailout package to ease a financial crisis in Mexico.
The national debt stands at $55 billion.
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