atomic； biological and chemical warfare.；原子；生物；化学战
These viruses were developed by human scientists in the era of Atlantis for the purposes of biological warfare.
With the threat of biological warfare looming, scientists are working on different ways to protect U.S. soldiers during wartime.
The effects of chemical warfare are very terrible, causing great harm.
This chemical warfare being waged in our fields might suggest that the plants have no defences of their own against disease.
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