它是一个随机偶然的过程吗？
可以说几乎没有任何科学发现是随机偶然的，因为人类总是在为着某一事物或目标而寻寻觅觅，无论所要寻觅的东西是心境的平静，抑或是有关生命本身之起源的解答。
It could be said that almost no discoveries are accidental because human beings are always looking for something, whether it is peace of mind or the answer to the origins of life itself.
演替受到许多因素的影响：土壤的性质、暴露于阳光和风中的时间、降水的规律性、偶然的殖民和许多其他随机因素。
Succession is influenced by many factors: the nature of the soil, exposure to sun and wind, regularity of precipitation, chance colonizations, and many other random processes.
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