Even under a clear blue sky, the village looked forbidding, AS all the houses were built of grey mud bricks.

农舍全用灰色的土坯建成，因此，即使在晴朗的蓝天底下，村庄看上去也会令人感到难以亲近。

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You can also enjoy mud packs with the natural mud, smooth, grey, soft, and plastic as butter.

你还可以享受天然泥制面膜，灰色的泥，光滑、柔软, 像黄油一样易塑。

《柯林斯英汉双解大词典》

He paints from a palette consisting almost exclusively of grey and mud brown.

他画画几乎只用包含灰色和土褐色的色调。

《柯林斯英汉双解大词典》

Medieval artists knew that mixing hues freely would produce grey mud (this is what threw Goethe off).

ECONOMIST: Science and history of colour

Having crossed a moonscape of cracked grey mud and many more dunes, we reach the first place with any real vegetation.

BBC: The ghostly shore of Namibia��s Skeleton Coast