英 [ˈbɪljənθ] 美 [ˈbɪljənθ]
num. 第十亿个
n. 十亿的（人或物）；十亿分之一
adj. 第十亿个的
adv. 第十亿个地
复数billionths
billionth /ˈbɪljənθ/
序数词 The billionth item in a series is the one you count as number one billion. 第10亿个
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。
分数词 A billionth is one of a billion equal parts of something. 十亿分之一
...a billionth of a second.
...十亿分之一秒。
position 1,000,000,000 in a countable series of things
one part in a billion equal parts
同义词： one-billionth
the ordinal number of one billion in counting order
十亿分之一的
... 十亿分之一秒 nanosecond ; Nanosecond One billionth of a second ; nanosecondnonosecond 十亿分之一的 billionth 十亿分之一居里 nanocurie ...
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。
Thus time and time's relativity are measurable by any hourglass, alarm clock, or atomic clock that can measure a billionth of a second.
因此，时间和时间的相对性可以用任何沙漏、闹钟或原子钟来测量，其中原子钟可测量出十亿分之一秒。
A nanometre is a billionth of a metre.
十亿分之一米是一纳米。
Nano is a prefix (from the Greek word for dwarf) meaning a billionth of something.
Apple said this week that its iTunes store had sold its 25 billionth song.
Cook also announced Wednesday that the 25 billionth app has been downloaded from the App Store.