Maybe you wanna time travel more than a few femtoseconds.

或许，你不只想穿梭这几飞秒。

youdao

"One may argue that now we have femtosecond lasers which generate pulses with a length of a few femtoseconds," he noted.

也许有人会说，我们现在已经拥有了飞秒激光器，可以产生仅几毫秒长的脉冲。

youdao

The X-ray pulses have a shutter speed of less than 100 femtoseconds (100 femtoseconds = 1/10 of a trillionth of a second).

这种X光脉冲快门速度不到100飞秒（100飞秒= 万亿分之一秒的1/10）。

youdao

But it was concentrated onto a speck a little more than one thousandth of a millimetre across and it lasted for just 30 femtoseconds (30 million billionths of a second).

ECONOMIST: Ultra-fast lasers

Such snapshots, which are captured by using pulses of laser light a few femtoseconds long rather than by physically clicking a shutter, are able to catch molecules in the process of reacting together.

ECONOMIST: The 1999 Nobel prizes

It can then release the light it absorbs in quick bursts that last a few femtoseconds each (with one femtosecond lasting one millionth of one billionth of a second), which is what ultrashort-pulse lasers do.

ENGADGET