underwater bulldozer

例句：

1. 1. The construction crew used an underwater bulldozer to clear the riverbed for the new bridge.
   施工队使用一台水下推土机清理了河道，为新桥让路。
2. 2.The engineers designed a special underwater bulldozer that could navigate through deep water and carry heavy loads.
   工程师们设计了一种特殊用途的水下推土机，能够穿越深水并携带重物。
3. 3. The underwater bulldozer was essential in the construction of the new harbor, as it could access areas that were otherwise inaccessible due to shallow waters.
   在建设新港口的过程中，这种水下推土机发挥了重要作用，因为它能够到达其他方法难以到达的区域。