English-Chinese/Chemical substance

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A chemical substance is any material with a known chemical composition. For example, water has the same properties and the same ratio of hydrogen to oxygen whether it came from a river or was made in a laboratory.

化学物质 是 具有 已知 化学组成的 任何 物质。例如,无论 是 来自 河流 还是 实验室 制造,水 都 具有 相同的 性质 和 相同的 氢气 与 氧气 比例。