In California, a lack of genetic variation in the Argentine ant has allowed the species to spread widely.
在加利福尼亚，阿根廷蚂蚁由于缺乏基因变异而得以广泛传播。
If a user were to try any other variation of his name, such as Internet email address, he would not be allowed to access the system.
如果一个用户尝试他的名称的任何其他变量，比如互联网电子邮件地址，将不允许他访问系统。
They don't reckon individuals, so therefore individual variation and imperfection can be allowed.
它们并不强调个体，因而也允许个体有差异和缺陷。
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