The smooth surfaces of oilslicks act like mirrors, reflecting sunlight to create the bright swirls.
浮油光滑的表面起到了镜面的作用,反射阳光形成明亮的漩涡。
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Oilslicks 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.