They spent much of their time knee-deep in mud.

他们在齐膝深的泥地里费了很长时间。

《柯林斯英汉双解大词典》

Originating in Finland's bogs, competitive skiers began using football matches in knee-deep mud to strengthen their legs.

这项运动起源于芬兰，那时，一些高山滑雪队队员在膝盖深的泥巴里踢足球，来锻炼腿部肌肉。

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They spent much of their time knee -deep in mud.

他们在齐膝深的泥地里费了好长时间。

youdao

In hamlets all along the DMZ, soldiers were knee-deep in mud and water as they helped farmers with the spring planting.

NPR: NKorean Soldiers Put Down Arms To Help Plant Crops

He smiles as we encounter what he terms 'a Balinese tractor': another farmer, this time attempting to guide two small chestnut-brown cows and a plough through freshly harvested land, knee-deep in mud and water.

BBC: High spirits in Bali

Instead we found Peter Bornu and his wife, knee-deep in thick, oily mud pulling at the branches of the mangroves and stacking them in their wooden boat.

CNN: Nigerians angry at oil pollution double standards