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明年的型号将配备多普勒声纳，以帮助避免与未察觉该设备的游泳者发生高速碰撞。
Next year’s model will have a Doppler sonar to help it avoid high-speed collisions with unsuspecting swimmers.
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高速前进时它难以识别用于导航的声纳信号。
High speeds can make it hard to decipher the sonar signals used for guidance.
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