我们是白天活动的生物，眼睛已经适应了在阳光下的生活。

We are diurnal creatures, with eyes adapted to living in the sun's light.

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当前我们对太阳光度的认知是：在地球的历史进程上，太阳光度应该是逐渐增加而不是减少的。

Our present understanding of the Sun's luminosity holds that it should have progressively increased, not decreased, over the course of Earth's history.

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当我们看到蓝色时，我们看到的是蓝色的阳光。

When we see blue, we are looking at the blue sunlight.

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