Oil, gasoline and pesticides, and other toxic agents can contaminate floodwater.

石油、汽油、杀虫剂以及其他有毒物质可能污染洪水。

In August 2020, the Russian opposition politician nearly died after he was poisoned with the toxic chemical nerve agent Novichok.

2020年8月，这位俄罗斯反对派政客身中化学神经毒剂诺维乔克，险些丧命。

The absences of chemical stabilizers in the samples of the detected toxic agents indicate they are relatively a recent production.

样本的毒剂检测表明其中缺少化学稳定剂，这说明这是最近才生产的。