Dolphins kept in captivity may be trained to do tricks or important work, like locating underwater mines.

海豚被人类捕获驯养，用来表演或者做一些重要的工作，比如定位水下矿山。

If we could understand how sea lions move, we could design vehicles that could one day stealthy explore shipwrecks, underwater mines or unexplored caves.

如果能够知道海狮怎样移动，就可以设计出将来能够秘密搜寻遇难船只，海底矿藏或未勘测的洞穴的车辆。