Definition

Examples

• 这种化学物质的浓度只有十亿分之一。
  Zhè zhǒng huàxué wùzhì de nóngdù zhǐ yǒu shí yì fēn.
  The concentration of this chemical is only one billionth.
• 他中彩票的概率不到十亿分之一。
  Tā zhòng cǎipiào de gàilǜ bú dào shí yì fēn.
  His chance of winning the lottery is less than one in a billion.
• 科学家测量到十亿分之一秒的时间变化。
  Kēxuéjiā cèliáng dào shí yì fēn miǎo de shíjiān biànhuà.
  Scientists measured a time change of one billionth of a second.