She rushed outside in time to see a half-mile wide mud and sand thundering down the hill toward them, knocking over hundreds of trees.

她及时跑了出去，看到半英里宽的泥沙从山上轰隆隆地向他们冲来，撞翻了几百棵树。

youdao

The bar was formed by the mud and sand deposited here over a long period of time.

河里的泥沙淤积在这里，年深日久便成了沙洲。

《新英汉大辞典》

The flood scoured away mud and sand.

洪水冲走了泥沙。

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The walker had to be pulled from the waterlogged mix of mud and sand by Dorset Fire Service on Friday.

BBC: Walker saved from waterlogged Swanage beach

And while these works may seem ephemeral - often made from sand and mud rather than canvas and paint, their creators clearly expect them to survive beyond the next exhibition, leaving detailed instructions of how to recreate the work, and often rebuilding it themselves (as Turner nominee Karla Black did last week with her powder and make-up creation on the floor of Tramway).

BBC: British Art Show 7 opens in Glasgow

The event is held every Memorial Day weekend in Ferndale, California, as artists race their bizarre wares across a 42-mile course over three days, including sections on land, sand, mud and water.

BBC: Kinetic sculptures race land and sea