Others, including the us and Russia, argue for more research in case smallpox returns, possibly as a biological weapon.

其他国家，包括美国和俄罗斯，都在争取通过研究天花病毒，获得更多的回报，并很有可能变成生物武器。

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National surveillance systems need to be in place well in advance of possible intentional use of a biological weapon.

国家监测系统需要在可能发生蓄意使用生物武器之前完全到位。

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National surveillance systems need to be in place well in advance of possible intentional use of a biological weapon.

国家监测系统需要在可能发生蓄意使用生物武器之前完全到位。

youdao