用超声波探测器可以定位鱼群,渔民们准备一种特别的装置:看起来象连着扶手的陀螺。
With help of a sonic depth-finder a proper shoal gets detected and the fishermen prepare special devices which look something like spinnings and attached to the handrails.
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电子探测器追踪到了鱼群。
Electronic detectors tracked down schools of fish.
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