Mamavirus is so big that it has its own dependent, a satellitevirus named Sputnik.
由于妈妈病毒非常大，它有依赖自己的叫做“旅行者号”(人类第一颗人造卫星)的卫星病毒。
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Monitoring duck populations for the H5N1 virus and tracking rice farming by satellite are the optimal ways to predict an outbreak's distribution, the researchers said.