单词：radioactive indicator
radioactive indicator的用法和样例：
例句
- Our goal is to obtain an indicator that can gauge concentrations.我们的目标是得到能够测量浓度的指示剂。
- Upon the addition of a good starch indicator a blue solution results.加入好的淀粉溶液指示剂，这时溶液变成兰色。
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