Experimentally, a light pulse propagating through the atomic vapor cell has its peak reaching the exit side before entering it, resulting in a negative transit time, and negative group velocity.

研究发现，当光脉冲通过一个原子气室时，在进入前其峰即到达出口处，造成负渡越时间和负群速。

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Dale Connone was getting ready to disembark from the boat's side exit when the ferry crashed.

WSJ: A Low-Key Commute on the Water, Then, 'All of Us Standing Went Flying'

There was billionaire Ted Turner, who briskly made his exit on the early side of the evening, and former Virginia Gov. (now Richmond Mayor) Doug Wilder, who looked a bit dazed.

FORBES: And They're Off!

He has two entry wounds in his side and two exit wounds.

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