When the two-row piles must be used, appropriate pile rowdistance should be chosen.
当不得不采用双排桩时，应该选择适当的桩排距。
2
Compute the distance from each data sample to the cluster center (our randomly selected data row), using the least-squares method of distance calculation.
计算从每个数据样例到群集中心(我们随意选中的数据行)的距离，使用距离计算的最小平方法。
3
These subtended angles correspond to a viewing distance of roughly 2.2 times the screen width at the back row of the seating down to 1.5 times the screen width at the front.