In a trench dug by a University of South Florida Coastal Research Lab team, layers of oil-stained sand light up orange under ultraviolet light. Clean sand appears violet.

南佛罗里达大学海岸研究实验室的团队挖掘的一条地沟，沾了油污的沙子在紫外线下为橙色，而干净的沙子为紫色。

youdao

Many yards from the Gulf of Mexico, dunes at the Gulf Islands National Seashore appear dotted with constellations of oil-contaminated, glowing sand under ultraviolet light.

紫外线照射下，距离墨西哥湾还有很远的海湾岛国家海滨上，受到石油污染的沙砾发出亮光，遍布在沙丘上。

youdao

After I climbed on to the sand dune in the light rain and gusty wind, the rain stopped and sun peeked out.

在细雨和刮风中，我爬上了沙丘，之后，雨停了，而且太阳悄悄地露出来了。

youdao

Crowds abandon their browsing to step onto the sand and watch the sky light up in blistering reds and oranges.

BBC: Driving Australia��s desolate Stuart Highway

Explore: Tiny Point Arena isn't exactly booming, but nearby are sand dunes, pocket beaches, the Point Arena Light Station, and the great Pinots of Anderson Valley.

CNN: 10 dazzling hideaways by the sea

Urine is filtered through sand, and the resulting fluid is sterilised with ultraviolet light.

ECONOMIST: Monitor: Flushed with pride | The