生物学处理过程的另一个好处是它无需加热或冷却，而且无有毒化学品。
Another advantage of the biological system is that it requires no heating or cooling, and no toxic chemicals.
无香溶剂，橙香味溶剂缺少毒性标识和对有毒化学消费品的警告标识。
The orange scented 'solvent and' odourless 'solvent products lack the toxicity symbols and warnings required for poisonous consumer chemicals.
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