we asked. 'Measuring the relative speed and angles of the balls, the distances to the pocket and final placement of the white ball?'
我们问，“测算球的相对速度和角度，判断白球到球袋的距离以及最后的位置呢？
2
Under the condition of re-observation, the relative errors of measuring area with the pocket GPS could reach 2.0% , which could meet the precision demand of measuring area in forestry practice.
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