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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"I think that the biggest strategic threat to the United States faces today is the possibility of another 9/11 with a nuclear weapon or a biological agent of some kind."

VOA: standard.2010.02.14

Concerns were raised in December 2011, partly because of a fear that the research could be misused and become a biological weapon.

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While the Times report said that the attack will involve a biological weapon, one government source said he was not aware of Walker saying anything of the kind.

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This is so even though powerful evidence exists that others around the world, notably the Soviet Union and Iraq, have proceeded to acquire biological weapon capabilities, notwithstanding the convention.

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