名词
中文翻译：Unknown
同义词：
['pH test', 'pH probe']
例句：
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1. The pH indicator in the solution changes color when the pH level is adjusted.
溶液中的pH指示剂在调节pH值时颜色会发生变化。
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2. The pH indicator was used to monitor the acidity of the soil.
pH指示剂被用来监测土壤的酸性。
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3. The pH indicator was used to determine the optimal conditions for plant growth.
pH指示剂被用来确定植物生长的最佳条件。