鸟类是西尼罗河病毒的自然宿主。
病毒的自然宿主:未知。
该州反对派领导人曾呼吁扑杀该病毒的自然宿主——蝙蝠。
The state opposition leader had called for a cull of bats, the virus natural host.
The only way that we knew how to grow it reliably was to grow it in its natural host: cows.
那目前我们所知道的唯一途径就是,利用它的自然宿主,奶牛
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