这是因为病毒性疾病一般发生在病毒的宿主从某个物种跳跃到另一个物种，继而进化以利用新宿主的方式变异之后。
That is because new viral diseases generally happen when a virus mutates in a way that allows it to jump species, and then continues to evolve to exploit its new host.
在2002年，他就得出了一个能预测癌症演化和扩散方式的方程组，比如说染色体何时开始变得不稳定，使得癌细胞在转移中发生变异。
In 2002 he worked out equations that can predict the way cancer evolves and spreads, such as when mutations emerge in a metastasis and chromosomes become unstable.
并探究近年来网络诗歌在创作主体、存在方式、功能模式、价值取向和社会影响力等方面发生的诸多变异。
The research in recent years, writing poetry in the main network, there are way, functionality mode, values and social influence in areas such as the many variations.
指出不良生活方式、情志所伤、生活环境的改变以及体质变异等因素是脑病痰热证发生的主要原因；
Pointing out bad life style and other factors are the mostly reason that caused the febrible due to phlegm in cerebral disease.
指出不良生活方式、情志所伤、生活环境的改变以及体质变异等因素是脑病痰热证发生的主要原因；
Pointing out bad life style and other factors are the mostly reason that caused the febrible due to phlegm in cerebral disease.
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