[译] 有些动物在深深的泥土里冬眠。
[误] Some animals go deeply under the mud for hibernation.

[正] Some animals go deep under the mud for hibernation.
[注] deep 和 deeply 都是副词, 在修饰具体动作时用 deep. 修饰形容词, 表示抽象意义时用 deeply。