在摆弄了10几年实验装置以后，Hinds博士的团队已经成功证明在千万亿分之一的精度下，电子的确是“完美”的球形。
After more than ten years of fiddling with their set-up, Dr Hines's team has succeeded in determining that the electron is round to within one part in a million billion.
在讨论原子级别时间的时候，物理学家用起皮秒（百万兆分之一秒）甚至飞秒（千万亿分之一秒）来都没任何不便。这是一方面。
Physicists have no trouble using, on the one hand, picoseconds (trillionths of a second) or even femtoseconds (quadrillionths of a second) to discuss time at the atomic scale.
这种飞秒激光脉冲持续兆分之一秒(千万亿分之一秒)的时间，但是在其短暂的持续时间内，功率峰值可以达到北美电网功率相当的水平。
A femtosecond laser pulse lasts on the order of a quadrillionth of a second but reaches a peak power equivalent to that of the entire power grid of North America during its short burst.
直到不久之前，对质子半径最好的测量是0.877飞米（千万亿分之一分尺），误差为在0.007飞米。
Until recently the best estimate of the proton radius was 0.877 femtometres with an uncertainty of 0.007 fm
直到不久之前，对质子半径最好的测量是0.877飞米（千万亿分之一分尺），误差为在0.007飞米。
Until recently the best estimate of the proton radius was 0.877 femtometres with an uncertainty of 0.007 fm
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