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来源:雅诚德英语网
The virus was a unique combination of genes which had apparently mixed in pigs somewhere in Mexico.
这种病毒拥有一种独特的基因组合,而这似乎是在墨西哥某地的猪群中诞生的。
The virus was a unique combination of genes which had apparently mixed in pigs somewhere in Mexico.
这种病毒拥有一种独特的基因组合,而这似乎是在墨西哥某地的猪群中诞生的。