名词
中文翻译：定向指数
同义词：
['Orientation Index', 'Orientation Metric', 'Orientation Measurement']
例句：
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1. The orientation index is calculated based on the angle between the sun and the observer's directionof travel.
定向指数是根据太阳和观察者的行进方向之间的夹角计算得出的。
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2.The orientation index is used to measure the accuracy of navigation systems.
定向指数用于衡量导航系统的准确性。
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3. The orientation index is an important factor in determining the success of a project.
定向指数是决定项目成功与否的重要因素之一。