The genesis may be related to its viral infection, gene mutation, environmental agent, and other hematological systemic disease.

其发生可能与病毒感染、基因突变、环境因素及其他血液系统疾病有关。

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The product as dark red liquid, no pollution, no corrosion, non-flammable, to the human body harmless environmental water-proofing agent.

该产品为暗红色液体，无污染、无腐蚀、不燃、对人身体无害的环保防水剂。

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Environmental protection of the chemical material-PVC and its innocuous agent was introduced in this paper, especially REC stabilizers, filling agents and processing modifiers.

本文介绍了PV C化学建材的环保化及其无毒助剂，主要是稀土类稳定剂、填充剂、加工改性剂。

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The Environmental Protection Agency has classified secondhand smoke as a known human cancer-causing agent.

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"The residence was of such a poor environmental condition that it was unsafe for us to breathe the air, " said Special Agent James Ash of the Bureau of Alcohol, Tobacco and Firearms, according to a sworn deposition obtained by the BBC.

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They would collect environmental samples such as soil, rubble or vegetation that may have been in contact with the chemical warfare agent and may still contain characteristic degradation products or even traces of it.

BBC: How to investigate chemical weapons allegations