天然突变——演化过程中在分子的层次上主要是经由随机的基因流而决定，并非借由天择所影响。
Neutral mutation — Evolution at the molecular level is primarily determined by mutational input and random genetic drift, rather than by natural selection.
由于这一过程是由生物体及其所在环境的相互作用而决定的，因此它并非具有严格的随机性。
As the process is determined by the interaction of organisms and their environment it is not strictly random.
它直观上可视作半动力系统随机中断(或出现问题)的时刻，亦可视作逐段决定马尔可夫过程的首次随机跳跃时刻。
In a sense, it can be seen as the time when semi-dynamic system is killed, or as the time the first random jump of piecewise deterministic Markov process.
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