(1) 首先计算两两样本之间距离，选择距离最大的两个样品。(2) 然后分别计算剩余的样本与已选择的两个样本之间的距离。(3) 对于每个剩余样本而言, 其与已选样品之间的最短距离被选择, 然后选择这些最短距离中相对最长的距离所对应的样本, 作为第三个样品。(4) 重复步骤(3) , 直至所选的样品的个数等于事先确定的数目为止，比如10个，或者20个。-(A) calculating a distance between the first two samples, select the maximum distance of the two samples. (2) and then calculate the distance and the remaining two samples between the selected sample. (3) For each of the remaining samples, the shortest distance between it and the selected sample is selected, and then select the shortest distance longest distance corresponding to the relative sample, as a third sample. (4) Repeat step (3) until the selected number of samples equal to the number of pre-determined so far, such as 10 or 20.