然而，至今仍不完全清楚，为什么有些树木倾向于制造红色素，而有些树木不去刻意制造色素，但还是会呈现出橙色或黄色。
What is still not fully understood, however, is why some trees resort to producing red pigments while others don't bother, and simply reveal their orange or yellow hues.
今天崎岖的峡谷内还不知名的路线，将来完全有可能成为地图中一条红色虚线。
Today's unknown route through a rugged canyon might well become a dotted red line on some future map.
同样的，火星地图主打完全互动图像和NASA的新数据集，使用户可以虚拟探索这颗红色星球，找到他们自己的科学发现。
Similarly, the Mars map features fully interactive images and a new NASA dataset that allow viewers to virtually explore the Red Planet and make their own scientific discoveries.
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