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。
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。
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。
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。
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