In both cases, the source of light is the same: the Sun.

在这两种情况下，光的来源都是太阳。

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The sun is the only source of light and heat we need.

太阳是我们所需要的光能和热能的唯一源泉。

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But Mars is much closer than the distant stars and an extended source of light.

不过火星比遥远的恒星距离我们更近，光源也更为扩展。

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Intensity, if we increase the intensity, we're not increasing the energy in each photon, we're just increasing the number of photons that we're shooting out of our laser, whatever our light source is.

强度，如果我们增加强度，我们增加的不是,每个光子的能量，我们增加的仅仅是,从我们激光源射出的光子数，无论我们的光源是什么。

麻省理工公开课 - 化学原理课程节选

Junior Seau was a source of light and life until injuries from football snuffed that out.

FORBES: When Playing Football Leads to Death

But while it lasted, work was a wellspring, a real source of light, the nurture of a beloved community.

NPR: Excerpt: 'Then We Came to the End'

More than just supplying a battery-free source of light, though, the lantern can function as a charger, thanks to a USB port built into the casing.

ENGADGET: Green House's lantern runs on salt and water, powers your gadgets via USB