stilb

例句：

1. 1. The chemical test is based on the reaction of the indicator with acids and bases.
   这种化学测试基于指示剂与酸和碱的反应。
2. 2. The color change of the indicator is used to determine the pH level of the solution.
   指示剂的颜色变化用于确定溶液的pH水平。
3. 3. The plant is known for its ability to survive in acidic soil.
   这种植物以其在酸性土壤中生存的能力而闻名。