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

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