On Jupiter's moon Europa, scientists have found dark stains on the ice that have them wondering if they might be caused by a similar process.

科学家在木卫二的冰面上发现了暗斑，这使他们猜测其形成过程是否与上述现象相同。

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It prevents dirt, soils, dark liquid, and oil stains from penetrating into the surface.

可以防止污垢，土壤，深色液体，和油渍渗透到石材表面。

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Beer stains on the dark-green corduroy, which her mother would detect, if she sniffed at them.

NEWYORKER: I.D.