Murphy博士在会议上说，迄今为止，这些实验仅仅是在10万亿分之一的概率上证实了等效原理。
So far, Dr Murphy told the conference, these experiments have merely confirmed the equivalence principle to one part in 10 trillion.
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.
再举另外一个例子，宇宙射线的波长不及万亿亿分之一英寸，而某些无线电波的波长却超过一英里！
As another example, cosmic rays have a wavelength of lessthan a millionth of a millionth of an inch, while some radio waves have wave lengths of over a mile!
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