It's also constantly mutating and could change to a form that spreads among humans, says Olga Jonas, the World Bank's Avian and human Influenza Global Program Coordinator.
这种病毒不断变异，并有可能变成一种可以在人类中传播的形式，世界银行的禽流感和人流感全球方案协调员OlgaJonas说。
It's also constantly mutating and could change to a form that spreads among humans, says Olga Jonas, the World Bank's Avian and human Influenza Global Program Coordinator.
这种病毒不断变异，并有可能变成一种可以在人类中传播的形式，世界银行的禽流感和人流感全球方案协调员OlgaJonas说。
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