Heavy rain turned the campsite into a mudbath.

大雨把露营地变成了一片泥沼。

《牛津词典》

You could pull into Calistoga and get yourself a mudbath (you still can), but that whole spa-day thing?

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The weather has a big impact on the festival, whether it is a mudbath or dustbowl - and Worthy Farm's rooks have given Mr Eavis hope for this year's outlook.

BBC: NEWS | Entertainment | Festival boss puts problems in past