chemical degradation agent
... Chemical And Thermal Degradation 化学热反应 chemical degradation agent 化学降解改进剂 opto-chemical degradation 光化学降解 ...
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chemical degradation agent
化学降解剂
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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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