According to law, the release of the biologicalcontrol agents must be authorized by the secretary of state for the environment.
根据法律规定，发放生物控制剂必须得到环境国务秘书的批准。
2
Of course, biologicalcontrol agents can safely be released only if it can be verified that they feed solely on the target weed.
当然，只有能够证明它们仅以目标杂草为食，生物控制剂才能安全释放。
3
In fact, scientists already have much of the information needed to assess the impact of biologicalcontrol of bracken, but it is spread among many individuals, organizations, and government bodies.