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