科学家们考虑过是放射性土壤导致的，或者是某种植物释放的毒素杀死了圆形植被造成的。
Scientists have suggested radioactive soil, or that toxins released from plants kills the vegetation in circular patterns.
将化疗药物、放射性物质以及生物毒素等与单克隆抗体偶联就得到单克隆类药物。
Monoclonal antibody agents can be obtained by coupling the chemotherapy agents, radioactive materials, biotoxin and monoclonal antibody.
所述抗癌抗体可以与毒素、酶、放射性化合物以及造血细胞缀合。
The anti-cancer antibodies can be conjugated to toxins, enzymes, radioactive compounds, and hematogenous cells.
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