这可能是基因的影响，或由于环境，饮食，药物，或过敏。
This can be genetically influenced, or due to environment, diet, medication, or allergies.
由于受染鸟类在其粪便中排泄大量病毒，在这种情况下接触受染粪便或病毒所污染环境的机会很多。
As infected birds shed large quantities of the virus in their faeces, opportunities for exposure to infected droppings or to environments contaminated by the virus are abundant under such conditions.
或者由于周遭环境的巨大变化，或者由于外部或内部生命无法弥补的缺口，一个单独的个体可以裂变成两个，这就是村上春树的意寓。
It's a Murakami trope, this, the single life split in two, either through radical change in circumstance or in the gap between the exterior and interior life of a divided self.
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