direction-finding compass
... direction-finding apparatus 测向仪 direction-finding compass 测向罗盘 direction-finding device 测向装置 ...
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Natural magnets were made into the first direction-finding compass by ancient Chinese people, which greatly improved a ship's ability to navigate over long distances.
中国古人利用天然磁石制成了第一台可以辨别方向的指南针，大大增强了船只的远航能力。
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