Another way would be for both types of virus to infect other animals with which humans have close contact, such as pigs.
另一种途径是两种病毒同时感染人类密切接触的另一种动物，例如猪。
Another way would be for both types of virus to infect other animals with which humans have close contact, such as pigs.
另一种途径是两种病毒同时感染人类密切接触的另一种动物，例如猪。
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