不利的相互作用是指两药合并应用后会降低疗效，增强毒性，或二者兼有。
Interactions that are classified as adverse either compromise therapeutic efficacy, enhance toxicity, or both.
亚硝酸盐(酯)用于食品防腐和彩色增强，尽管它们的毒性很强，会引起死亡，与胺结合后产生致癌物。
Nitrites are used as food preservatives and color enhancers, though they are so toxic they have caused deaths and combine with amines to produce carcinogens.
并且会导致空气中污染物不易扩散，增强有害物质的毒性，严重的，还可能会导致毒雾发生。
And can lead to air pollutants is not easy to spread, enhanced the toxicity of harmful substances, serious, may also cause smog.
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