I have to go after Steve Mercer, she thought for probably the billionth time.
我一定要去找史蒂夫·默瑟，这大概是她第十亿次这样想了。
A nanosecond is one-billionth of a second.
1纳秒为十亿分之一秒。
In February 2010, the ten-billionth song was sold on iTunes.
2010年2月，iTunes出售的歌曲已经达到了100亿首。
Days from now, the human family will welcome its seven billionth member.
再过几天，人类大家庭将迎来第70亿个成员。
Days from now, the human family will welcome its seven billionth member.
再过几天，人类大家庭将迎来第70亿个成员。
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