The traffic signals along Factoria Boulevard in Bellevue, Washington, generally don't flash the same length of green twice in a row, especially at rush hour.

华盛顿贝尔维尤的法克托利亚大道上的交通信号通常不会连续两次闪烁相同时长的绿灯，尤其是在交通高峰期。

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This "green flash," caused by light refracting in the atmosphere, is rarely seen.

这种“绿色闪光”，是由大气中的光折射所引起的，很难见到。

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A green flash is also visible for a rising Sun, but takes better timing to spot.

绿色的闪光也出现在太阳升起时，但是在合适的时机及位置才能观察到。

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Hotel keycards flash green for entry and red for stop.

WSJ: New Outlook for Colorblindness

The reason the eye sees the flash as green, according to Dr Young, is that someone waiting to watch it will usually have been staring at the setting sun for several minutes.

ECONOMIST: In a flash

Subtract that undetected red from the yellow of the flash, and green is left.

ECONOMIST: In a flash