The cause of the opening and closing is probably the difference in light.

开启和关闭的原因可能是光线的不同。

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Although we talked about Vitamin D and sunlight, it can make a huge difference in how you feel if you go to a tanning salon to get some light on your skin.

尽管我们已谈到维生素D和阳光，但是如果你刻意去参加日晒沙龙来摄取阳光到皮肤的话，它会让你感觉到巨大的差别。

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The new PNAS study also sheds light on the difference between meaning and happiness, but on the biological level.

新的 PNAS 研究也揭示了意义和幸福之间的差异，但只是在生物学层面上。

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All of these questions can be explored in the interactive calculator CNN created to help shed light on the difference in legal protections among the 50 states.

CNN: America is at a crossroads on gay rights

The only difference is the light.

WSJ: Lighting Designer Al Gurdon: The Light Master of Super Bowl Halftime

Because radiation from the Crab nebula is so energetic, the electrons that created it must have been travelling very close to the speed of light so close that the difference between the two speeds would bump up against Planck-scale graininess, and show up in the spectrum of the radiation.

ECONOMIST: Planck-scale physics