苯是一种有高毒性的毒素，它会致癌。
Benzene is a highly poisonous toxin that is also carcinogenic.
硝基苯类化合物是一类高毒性的有机污染物，它们性质稳定，极难生化降解。
Nitrobenzene compounds, a highly toxic compound, is very difficult to be degraded and its chemistry property is very stabilizing.
机舱起火会产生具有高浓度和高毒性的烟雾，因此要捂住口鼻防止吸入过量烟雾。
The smoke in an airplane fire can be very thick and highly toxic, so cover your nose and mouth with a cloth to avoid breathing it in.
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