With stem cells, the main risk is not the sort of chemical toxicity associated with a drug; rather it is of an unusual type of tumour called a teratoma.

对干细胞来说，主要的风险不在于药物引起的细胞毒性；而是一种叫做畸胎瘤的非常见肿瘤。

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Quantitative structure activity relationship (QSAR) plays an obvious role in the study and use of toxicology. The prospect of application of QSAR in chemical toxicity research is summarized.

定量构效关系在毒理学的研究和实践中发挥着重要的作用。综述了定量构效关系在化合物毒性研究中的应用进展。

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Abiotic stresses, such as drought, salinity, extreme temperatures, chemical toxicity, and oxidative stress, are serious threats to agriculture and result in the deterioration of the environment.

干旱、盐害、极端温度、化学毒害和氧化胁迫等非生物胁迫严重影响农业生产，并导致环境退化。

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The plastic also acts as a chemical sponge absorbing some of the worst pollutants in the sea and increasing its toxicity when swallowed.

CNN: Fighting the tide of plastic bags in a world awash with waste