The great fear is that the next mass assault will involve the use of lethal biological agents, poisonous chemicals or radioactive material.
人们极为害怕下一次大规模的袭击会使用致命的生物制剂、有毒的化学物质或放射性物质。
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It is grouped with the world's most lethal potential biological weapons agents, sharing "select agent" status with the pathogens that cause smallpox, anthrax and plague.