How to ensure the safety navigation of vessels was an important issue for scholars in navigation field.

如何保障船舶航行安全一直是航海界专家学者研究的重点。

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Experiments have shown that the system can extract landmarks stably, achieve high accuracy rate of place recognition and guarantee safety navigation in unknown environments for mobile robot.

实验结果表明该系统路标提取稳定、位置识别率高、定位精确，能够保证机器人在未知环境中的安全导航。

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Safety navigation should be borne in mind.

时刻牢记安全航行第一。

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This digital elevation model (DEM) will be put to myriad uses - everything from improving the safety of aircraft navigation to understanding better which areas of ground are most at risk during a flood.

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OnStar, the GM subsidiary that provides navigation and safety systems for cars, took a terrible turn last week when it announced a huge change to its contract with its customers.

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"It will be every bit as luxurious as the original Titanic but of course it will have state-of-the-art 21st Century technology and the latest navigation and safety systems, " he said in a statement.

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