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A substance or material that is harmful or toxic to living organisms or the environment.
这些化学品被归类为有害物质，必须妥善处理。
These chemicals are classified as harmful substances and must be properly handled.
This term is commonly used in environmental science, chemistry, and public health contexts.
This term is frequently used in environmental reports and safety regulations.
The term is composed of '有害' (harmful) and '物质' (substance/material).
This term is often used in discussions about pollution, chemical safety, and environmental protection.