Four ships continue the deep-water sonar search for the missing Malaysian airliner off the west coast of Australia.

四艘船只继续在澳大利亚西海岸对失联航班MH370进行深水声纳搜索。

We built a flatpack sonar search vessel on a beach in 1981, patrolled up and down the loch.

1981 年， 我们在海滩上建造了一艘平板声纳搜索船，在湖中上下巡逻。