以下为句子列表：
英文: Indicator A substance used to test for acidity or alkalinity of a solution by a color change.
中文: 指示剂：是一种用颜色的变化来表示溶液中酸碱程度的物质。
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英文: It has good colour retention, excellent resistance to water and alkalinity on the concrete surface. Applied at ambient temperature.
中文: 具有保色性佳、耐水洗和混凝土表面的碱度等特点，对施工温度没有要求。
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英文: The compressive strength of lower alkalinity steel slag autoclaved product decreases when mixed with pyrite tailing alone.
中文: 单独掺入硫铁尾矿，低碱度钢渣蒸压制品的抗压强度下降。
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英文: The effect of pyrite tailing on the compressive strength of lower alkalinity steel slag autoclaved products was explored by analyzing the mechanical properties, the kinds of hydrates and the microstructures of the testing samples.
中文: 通过对各试样所进行的力学性能、水化产物种类及形貌的分析，探讨了硫铁尾矿对低碱度钢渣蒸压制品抗压强度的影响。
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英文: The effect of the water alkalinity and the water hardness on noodle quality was reviewed.
中文: 摘要研究了水的碱度、硬度对面条品质的影响。
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