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.

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数以兆计的中微子在每一秒都穿过你我的身体，却没有留下任何可辨识的踪迹。

Trillions pass through everyone's body every second leaving no discernible trace.

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全功率运行时，数兆的质子在大型强子对撞机的加速环中加速，一秒钟可绕行11245圈，速度达到光速的99.99%。

At full power, trillions of protons will race around the LHC accelerator ring 11, 245 times a second, travelling at 99.99 percent the speed of light.

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