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。

youdao

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