But this color darkens when exposed to the sun.
但这种颜色暴露在阳光下将会变暗。
As the sun sets, the sky darkens and the moon and stars appear.
随着太阳落下，天空逐渐变黑，而月亮和星星开始出现。
Why the sun lightens our hair, but darkens our skin?
为什么太阳能把头发晒浅，却能把皮肤晒黑？
The fireworks display will begin at night, when the sky darkens.
烟花将在傍晚，当天空变黑的时候放。
The fireworks display will begin at night, when the sky darkens.
烟花将在傍晚，当天空变黑的时候放。
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