热浸镀锌或天然色。

Hot Dip galvanized or Self Colored.

浮油出名的难以被发现在天然色卫星图像上，因为稀薄光泽的石油仅仅略黑于深蓝色的大海。

Oil slicks are notoriously difficult to spot in natural-color (photo-like) satellite imagery because a thin sheen of oil only slightly darkens the already dark blue background of the ocean.

上图带有间隔100米等高线的天然色卫星照片显示的是莫纳罗亚山峰顶，它可以告诉我们为什么峰顶的火山喷发极少触及到气象站。

This natural-color satellite image of the summit of Mauna Loa overlaid with 100-meter (330-foot) contour lines helps illustrate why volcanic emissions from the summit rarely reach the observatory.