The first is Dead Reckoning, which computes its own positions from the direction and speed data continuously obtained from the gyroscope and speedometer in the vehicle.
第一是推测领航，指不断由车辆的陀螺仪和速度计显示的方向和速度数据计算本身的位置。
Other than requiring working seats belts and speedometer, the bill, as currently written, does not address any specific vehicle systems or recommended safety performance.
而现行的法案处了对安全带和车速表有要求外，对具体的汽车体系和安全性能没有做出任何规定。
Other than requiring working seats belts and speedometer, the bill, as currently written, does not address any specific vehicle systems or recommended safety performance.
而现行的法案处了对安全带和车速表有要求外，对具体的汽车体系和安全性能没有做出任何规定。
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