在接下来的两周内，您能帮助科学家及宇航员们建立起一张全球光污染地图，因为他们发现夜空不再那么的清澈透明。
During the next two weeks, you can help build a map of global light pollution, assisting scientists and astronomers as they monitor the loss of virgin night skies.
当你在明亮的阳光下驶入海湾，空气因风暴的反复冲刷而清澈透明。
You sail into a bay in bright sunshine and air scrubbed clean by the ceaseless circumpolar wind.
蓝色的眼睛清澈透明，很容易看得透彻，而棕色的眼睛就比较混浊了。
A blue eye is not opaque, you can see deeply into it, and a brown eye is very opaque.
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