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》

Then two young men dripping in mud came into the bar.

过了一会，有二个年轻人进到酒吧，浑身泥污。

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