This uses a succession of cues to whittle away the alternatives until only one remains. 这一方法使用一连串线索来逐渐减少排除选项，直到最后只剩下一个选项。
Another way of looking at species packing is to see how closely related species are distributed in relation to one another. 研究物种焦聚现象的另一方法是观察近缘物种彼此在分布上有什么关系。
