U-shaped burrow

例句：

1. 1. The team used a U-shaped burrow to hide their supplies.
   团队使用一个U形地洞来隐藏他们的物资。
2. 2. The children were playing in the U-shaped burrow.
   孩子们在U形地洞里玩耍。
3. 3.The scientists discovered an unusual U-shaped burrow in the desert.
   科学家们在一个沙漠中发现了一处不寻常的U形地洞。