However, after the experiment described above the difference in time between the two clocks was less than a billionth of a second, which is why very accurate clocks were needed.

但是经过上述实验后，两个钟表的时间差距不到十亿分之一秒，所以需要用两个非常精准的钟表。

youdao

Dates and Times provides a broad spectrum of date manipulation functionality, including calculating the difference between two dates and retrieving the local system current date and time.

Dates and Times提供了大量的日期操作功能，包括计算两个日期之间的差，以及检索本地系统的当前日期和时间。

youdao

Now they do say in the paper "It is worth stressing that this measurement does not rely on the difference between a start (t0) and a stop signal but on the comparison of two event time distributions."

他们的确在论文中提到“值得注意的是这一测量并不依赖于开始(t0)与结束信号之间的时间差，而是取决于两个事件的时间分布。”

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For example, among women giving birth for the first time, there was a two-fold difference between hospitals with the highest and lowest rates of induction of labour (17% compared to 38%), emergency caesarean section after induction of labour (20% to 40%) and instrumental delivery (16% to 32%).

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But Sneijder and Robben again made the difference for the two-time runners-up, who were left hanging on at the end following Maxi Pereira's injury-time reply.

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Their telephone conversations were hampered by the time-difference between central America and western Europe, but the two men did keep in close touch.

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